Transmission

Abstract

The invention relates to a transmission for adjusting a first rotary member relative to a second rotary member with a drive shaft that is concentric with the first and the second rotary member. A high gear reduction ratio combined with small dimensions and a robust design may be achieved in such a way that the drive shaft is connected to a spindle on which a pull member is wound, and that one end of said pull member is firmly connected to said first rotary member and that the pull member is diverted over at least one deflection pulley which is firmly connected to said second rotary member.

What is claimed is:  
     
         1 . A transmission for adjusting a first rotary member relative to a second rotary member with a drive shaft that is concentric with the first and the second rotary member, wherein a drive shaft is connected to a spindle on which a pull member is wound, and wherein one end of said pull member is firmly connected to said first rotary member and wherein the pull member is diverted over at least one deflection pulley which is firmly connected to said second rotary member.  
     
     
         2 . A transmission according to    claim 1   , wherein two pull members are wound on the spindle in opposite directions, the ends of said pull members being each firmly connected to said first rotary member and the pull members being each diverted over a deflection pulley firmly connected to said second rotary member.  
     
     
         3 . A transmission according to    claim 1   , wherein said pull member has the shape of a band.  
     
     
         4 . A transmission according to    claim 1   , wherein said pull member is designed as a cable.  
     
     
         5 . A transmission according to    claim 1   , wherein the distance of the fastening point of the pull member on said first rotary member as well as the distance of the axis of the deflection pulley from the common axis relative to the diameter of the spindle are great.  
     
     
         6 . A transmission according to    claim 5   , wherein the distance of the fastening point of the pull member from the common axis is equal to five to fifty times, preferably ten to thirty times, the diameter of the spindle.  
     
     
         7 . A transmission according to    claim 1   , wherein a drop cam for guiding the pull member is provided in the region of the fastening point of the pull member.  
     
     
         8 . A transmission according to    claim 1   , wherein the pull member is guided over several deflection pulleys which are alternately linked to the first rotary member and to the second rotary member.  
     
     
         9 . A transmission according to    claim 1   , wherein a tension member is provided for biasing the pull member.  
     
     
         10 . A device for adjusting the phase angle of a camshaft of an internal combustion engine in which the camshaft is adjustable relative to a drive gear, wherein a transmission according to one of the claims  1  through  9  is provided, the camshaft being firmly connected to the first rotary member and the drive gear being firmly connected to the second rotary member.  
     
     
         11 . A device according to    claim 10   , wherein an electric motor for adjusting the phase angle of the camshaft is connected to the drive shaft of the transmission.  
     
     
         12 . A device according to    claim 11   , wherein a housing of the electric motor is firmly connected to the camshaft or to the drive gear.