Vibration plate having belt drive having multiple deflection

Abstract

A vibration plate has an upper mass having a drive and a lower mass which is mounted so it is elastically moveable relative to the upper mass. The lower mass has a vibration generator and a ground contact plate. The drive is coupled by a belt drive to the vibration generator. The belt drive has a drive disk which is provided on the drive, an output disk which is provided on the vibration generator, and a belt which circulates between the drive disk and the output disk. To this end, at least two further deflection rollers are provided for guiding the belt.

1 . A vibrating plate comprising:
 an upper mass that has a drive;   a lower mass that has a vibration generator and a soil contact plate, the lower mass being mounted so as to be flexibly movable relative to the upper mass; and   a belt drive that couples the drive to the vibration generator; the belt drive including
 a drive disk provided on the drive; 
 a driven disk provided on the vibration generator; and 
 a belt that circulates between the drive disk and the driven disk; wherein at least two additional deflecting rollers are provided for guiding the belt. 
   
     
     
         2 . The vibrating plate as recited in  claim 1 , wherein the deflecting rollers are situated on the same side of an imaginary connecting line between an axis of rotation of the drive disk and an axis of rotation of the driven disk. 
     
     
         3 . The vibrating plate as recited in  claim 1 , wherein parts of the belt run between elements of the upper mass and elements of the lower mass and couple the elements of the upper mass to the elements of the lower mass and run essentially horizontally or with an angle less than 30° to the horizontal. 
     
     
         4 . The vibrating plate as recited in  claim 1 , wherein:
 both deflecting rollers are mounted on the upper mass; or   one deflecting roller is mounted on the upper mass and one deflecting roller is mounted on the lower mass.   
     
     
         5 . The vibrating plate as recited in  claim 1 , wherein:
 the vibrating plate is a plate compactor plate;   the vibration generator has an unbalanced shaft that is situated in an area that, seen in the direction of travel, is a front area of the vibrating plate; and wherein   the deflecting rollers are situated in a rear area of the vibrating plate.   
     
     
         6 . The vibrating plate as recited in  claim 1 , wherein:
 one deflecting roller is mounted on the upper mass and one deflecting roller is mounted on the lower mass; and wherein   parts of the belt run between the upper mass and the lower mass and run essentially parallel to one another.   
     
     
         7 . The vibrating plate as recited in  claim 1 , wherein the rollers on the upper and lower masses are arranged in first and second banks, respectively, the distance between a deflecting roller of one bank and the drive disk, or driven disk, associated via the run of the belt, of the other bank is as large as possible. 
     
     
         8 . The vibrating plate as recited in  claim 1 , wherein the deflecting rollers are situated in such a way that a wrap angle on at least one of the drive disk and the driven disk is greater than 180°. 
     
     
         9 . The vibrating plate as recited in  claim 1 , wherein at least one of the deflecting rollers is mounted cardanically and/or so as to be longitudinally displaceable along its axis of rotation. 
     
     
         10 . The vibrating plate as recited in  claim 1 , further comprising a tension roller that tenses a return strand of the belt. 
     
     
         11 . The vibrating plate as recited in  claim 1 , further comprising a compensating roller that tenses a return strand of the belt. 
     
     
         12 . The vibrating plate as recited in  claim 11 , wherein:
 the compensating roller is held in a normal position by a spring device;   the pre-tension of the spring device is set such that when a prespecified belt force is exceeded in the return strand, the compensating roller moves the normal position against the action of the spring device, so that the compensating roller yields to the belt force and the belt force acting in the return strand is reduced.   
     
     
         13 . The vibrating plate as recited in  claim 1 , wherein the axes of rotation of the deflecting rollers are inclined relative to the horizontal. 
     
     
         14 . The vibrating plate as recited in  claim 1 , wherein the deflecting rollers are situated so as to be at least partly axially adjacent to one another. 
     
     
         15 . The vibrating plate as recited in  claim 1 , wherein the belt is used to drive an additional aggregate. 
     
     
         16 . The vibrating plate as recited in  claim 1 , wherein four deflecting rollers are provided,
 two deflecting rollers being situated in a front area of the vibrating plate as seen in a direction of travel, and two deflecting rollers being situated in a rear area of the vibrating plate; or   one deflecting roller being situated in the front area and three deflecting rollers being situated in the rear area; or   three deflecting rollers being situated in the front area and one deflecting roller being situated in the rear area.   
     
     
         17 . The vibrating plate as recited in  claim 1 , wherein:
 one of the deflecting rollers is situated on the upper mass and one of the deflecting rollers is situated on the lower mass; and wherein   the belt is guided in such a way that its one side circulates around the drive disk and its other side circulates around the driven disk.   
     
     
         18 . The vibrating plate as recited in  claim 1 , wherein at least one of the deflecting rollers is mounted both on the upper mass and on the lower mass. 
     
     
         19 . The vibrating plate as recited in  claim 18 , wherein at least one deflecting roller is mounted on two lever elements, one of which is pivotably mounted on the upper mass and one of which is pivotably mounted on the lower mass. 
     
     
         20 . The vibrating plate as recited in  claim 18 , wherein each of the lever elements is mounted cardanically and/or elastically on an associated one of the upper mass and the lower mass.