Screed assembly with functional coupling between a height adjustment device for a screed plate carrier and a tilting device for a secondary screed plate attached to the screed plate carrier

Abstract

A screed assembly for a road paver comprises a main screed and a secondary screed. The main screed comprises a main screed plate for contact with paving material. The secondary screed comprises a screed plate carrier and a secondary screed plate for contact with the paving material. The secondary screed plate is attached to the screed plate carrier so as to be tiltable about a tilting axis. The screed assembly comprises a height adjustment device configured to lower or raise the screed plate carrier relative to the main screed. The screed assembly further comprises a tilting device configured to change a tilting angle of the secondary screed plate about the tilting axis.

What is claimed is: 
     
         1 . A screed assembly for a road paver, comprising:
 a main screed with a main screed plate for contact with paving material; and   a secondary screed with a screed plate carrier and a secondary screed plate for contact with the paving material;   wherein the secondary screed plate is attached to the screed plate carrier so as to be tiltable about a tilting axis;   wherein the screed assembly comprises a height adjustment device configured to lower or raise the screed plate carrier relative to the main screed;   wherein the screed assembly comprises a tilting device configured to change a tilting angle of the secondary screed plate about the tilting axis; and   wherein the height adjustment device and the tilting device
 a) are functionally coupled such that when the screed plate carrier is lowered or raised relative to the main screed by the height adjustment device, the tilting device is automatically actuated to change the tilting angle of the secondary screed plate about the tilting axis, and/or 
 b) are functionally coupled such that when the tilting angle of the secondary screed plate about the tilting axis is changed by the tilting device, the height adjustment device is automatically actuated to lower or raise the screed plate carrier relative to the main screed. 
   
     
     
         2 . The screed assembly according to  claim 1 , wherein the tilting axis extends transversely to a paving direction. 
     
     
         3 . The screed assembly according to  claim 1 , wherein lowering the screed plate carrier by the height adjustment device actuates the tilting device for tilting the secondary screed plate about the tilting axis for increasing an angle of attack of the secondary screed plate with respect to a subgrade, and/or wherein raising the screed plate carrier by the height adjustment device actuates the tilting device for tilting the secondary screed plate about the tilting axis to reduce an angle of attack of the secondary screed plate with respect to a subgrade. 
     
     
         4 . The screed assembly according to  claim 1 , wherein lowering the screed plate carrier by the height adjustment device actuates the tilting device for tilting the secondary screed plate about the tilting axis for reducing an angle of attack of the secondary screed plate with respect to a subgrade, and/or wherein raising the screed plate carrier by the height adjustment device actuates the tilting device for tilting the secondary screed plate about the tilting axis to increase an angle of attack of the secondary screed plate with respect to a subgrade. 
     
     
         5 . The screed assembly according to  claim 1 , wherein an area of the secondary screed plate located at a rear in a paving direction is mounted on the tilting axis. 
     
     
         6 . The screed assembly according to  claim 1 , wherein the tilting device is configured to raise or lower an end of the secondary screed plate opposite the tilting axis for changing the tilting angle of the secondary screed plate relative to the screed plate carrier. 
     
     
         7 . The screed assembly according to  claim 1 , wherein the tilting device comprises an actuating connection connected to the secondary screed plate, wherein the actuating connection is configured to automatically rotate the secondary screed plate about the tilting axis when the screed plate carrier is lowered or raised by the height adjustment device. 
     
     
         8 . The screed assembly according to  claim 7 , wherein the actuating connection is connected to a front area of the secondary screed plate with respect to a paving direction. 
     
     
         9 . The screed assembly according to  claim 1 , wherein lowering or raising the screed plate carrier relative to the main screed by a carrier adjustment length actuates the tilting device to lower or raise a front end of the secondary screed plate relative to the screed plate carrier by a screed plate adjustment length, wherein the screed plate adjustment length is proportional to the carrier adjustment length. 
     
     
         10 . The screed assembly according to  claim 9 , wherein a proportionality factor between the carrier adjustment length and the screed plate adjustment length corresponds at least substantially to a ratio between a length of the main screed plate in a paving direction and a length of the secondary screed plate in the paving direction. 
     
     
         11 . The screed assembly according to  claim 1 , wherein the screed assembly comprises a drive configured to lower or raise the screed plate carrier relative to the main screed. 
     
     
         12 . The screed assembly according to  claim 11 , wherein the drive is coupled to the tilting device and is configured to drive the tilting device. 
     
     
         13 . The screed assembly according to  claim 12 , wherein the drive is configured to drive the height adjustment device with a first transmission ratio and to drive the tilting device with a second transmission ratio different from the first transmission ratio. 
     
     
         14 . The screed assembly according to  claim 1 , further comprising a tilt adjustment device which allows changing the tilting angle of the secondary screed plate about the tilting axis without actuating the height adjustment device. 
     
     
         15 . A road paver, comprising:
 a towing vehicle with a hopper located at a front of the towing vehicle in a paving direction for receiving paving material, and   a screed assembly according to  claim 1  attached to a rear of the towing vehicle in the paving direction.