Motor-pump assembly

Abstract

A motor-pump assembly for providing pressure for a motor vehicle brake system actuation device with a pneumatic brake booster, including a pump and an electric motor driving the pump. The pump is a double diaphragm pump with two opposing working diaphragms each clamped between a pump housing and a working chamber cover to delimit a working chamber and which are movable by a crank drive having an eccentric and connecting rods. The connecting rods each have a connecting rod shank and a connecting rod eye and are mounted movably on the eccentrics by roller bearings. To provide a motor-pump assembly which meets requirements relating to acoustic comfort, a resilient decoupling is provided between each connecting rod eye and the roller bearing, which damps transmission of vibrations to the roller bearing in the connecting rod shank which occur on a force direction change on the rotation of the crank drive.

1 .- 12 . (canceled) 
     
     
         13 . A motor-pump assembly for providing pressure for a brake actuation device of a motor vehicle brake system with a pneumatic brake booster, in particular a vacuum brake booster, comprising a pump and an electric motor driving the pump, wherein the pump is provided as a double diaphragm pump with two opposing working diaphragms which are each clamped between a pump housing and a working chamber cover and thus delimit a working chamber and which are movable by a crank drive having an eccentric and connecting rods, and wherein the connecting rods each have a connecting rod shank and a connecting rod eye and are mounted movably on the eccentrics by roller bearings, wherein between each connecting rod eye and the roller bearing, a resilient decoupling is provided which damps a transmission to the roller bearing of vibrations in the connecting rod shank which occur on a force direction change on the rotation of the crank drive. 
     
     
         14 . The motor-pump assembly as claimed in  claim 13 , wherein for resilient decoupling, the roller bearing is provided resiliently embedded in the connecting rod eye. 
     
     
         15 . The motor-pump assembly as claimed in  claim 14 , wherein the resilient decoupling is provided as an elastomer layer between the connecting rod eye and an outer ring of the roller bearing. 
     
     
         16 . The motor-pump assembly as claimed in  claim 15 , wherein the elastomer layer is created by injection molding around the roller bearing placed in the connecting rod eye. 
     
     
         17 . The motor-pump assembly as claimed in  claim 13 , wherein to receive the roller bearing, a connecting rod ring is provided which is resiliently embedded in the connecting rod eye. 
     
     
         18 . The motor-pump assembly as claimed in  claim 17 , wherein the connecting rod is provided fixed by injection molding with the elastomer layer. 
     
     
         19 . The motor-pump assembly as claimed in  claim 17 , wherein a lock is provided between the connecting rod ring and the connecting rod eye. 
     
     
         20 . The motor-pump assembly as claimed in  claim 19 , wherein a mechanical lock is provided between the connecting rod ring and the connecting rod eye. 
     
     
         21 . The motor-pump assembly as claimed in  claim 20 , wherein the mechanical lock is a bayonet lock. 
     
     
         22 . The motor-pump assembly as claimed in  claim 19 , wherein a resilient lock is provided between the connecting rod ring and the connecting rod eye. 
     
     
         23 . The motor-pump assembly as claimed in  claim 22 , wherein the resilient lock is formed by undercuts in the connecting rod ring into which the elastomer layer can flow for locking. 
     
     
         24 . The motor-pump assembly as claimed in  claim 23 , wherein on an inside of the connecting rod eye, protrusions are provided which are surrounded by the elastomer layer for locking.