Motor vehicle vacuum pump

Abstract

A motor vehicle vacuum pump includes a pump chamber with a pump rotor, an outlet chamber, a separating wall which separates the pump chamber from the outlet chamber, and an outlet valve arranged in the separating wall. The outlet valve is designed so that a compressed gas escapes from the pump chamber into the outlet chamber therethrough. The outlet valve is formed by a valve opening in the separating wall, a valve seat having a raised shape arranged around the valve opening, and a leaf spring as a valve body. The leaf spring abuts on the valve seat in a closed position and is spaced from the valve seat in an open position. The leaf spring has a radial overlap with the valve seat in the closed position of less than 1.5 mm and a radial projection outward beyond the raised valve seat which is larger than 1.0 mm.

What is claimed is: 
     
         1 - 7 . (canceled) 
     
     
         8 : A motor vehicle vacuum pump comprising:
 a pump chamber in which a pump rotor is arranged to rotate so as to provide a compressed gas;   an outlet chamber into which the compressed gas escapes from the pump chamber;   a separating wall arranged to separate the pump chamber from the outlet chamber; and   at least one outlet valve arranged in the separating wall, the at least one outlet valve being designed as a check valve so that the compressed gas escapes from the pump chamber into the outlet chamber therethrough,   wherein,   the at least one outlet valve is formed by;
 a valve opening arranged in the separating wall, 
 a valve seat arranged around the valve opening, and 
 a leaf spring provided as a valve body, 
 wherein,
 the leaf spring is configured to move between a closed position of the at least one outlet valve in which the leaf spring abuts on the valve seat, and an open position of the at least one outlet valve in which the leaf spring is spaced from the valve seat, 
 the valve seat is formed with a raised shape, 
 the leaf spring, in the closed position, is arranged to have a radial overlap with the valve seat of less than 1.5 mm, and 
 a radial projection of the leaf spring which extends radially outward beyond the raised valve seat is larger than 1.0 mm. 
 
   
     
     
         9 : The motor vehicle vacuum pump as recited in  claim 8 , wherein the raised valve seat is surrounded by at least one adjoining chamfer. 
     
     
         10 : The motor vehicle vacuum pump as recited in  claim 9 , wherein the at least one adjoining chamfer is formed at an inner circumference of the raised valve seat. 
     
     
         11 : The motor vehicle vacuum pump as recited in  claim 9 , wherein the at least one adjoining chamfer is formed at an outer circumference of the raised valve seat. 
     
     
         12 : The motor vehicle vacuum pump as recited in  claim 8 , wherein,
 the valve opening and the leaf spring are each arranged to have a kidney-shape, and   the leaf spring is fixed at a longitudinal end of the valve opening.   
     
     
         13 : The motor vehicle vacuum pump as recited in  claim 8 , wherein,
 two outlet valves are arranged in the separating wall,   a leaf spring is provided for each of the two outlet valves, and   the two leaf springs are formed by a single common spring body.   
     
     
         14 : The motor vehicle vacuum pump as recited in  claim 8 , wherein the raised valve seat comprises an elevation of at least 0.5 mm. 
     
     
         15 : The motor vehicle vacuum pump as recited in  claim 8 , wherein the raised valve seat comprises an elevation of at least 1.0 mm.