A breaking-up unit for a total quantity of bulk material in a tangled position, in particular mulched or chopped material, shortened straw or hay, into smaller partial quantities, the breaking-up unit comprising - a receiving device, which receiving device is configured to be shaft-shaped or funnel-shaped and defines a supply area and a discharge area located on the bottom side, - a first conveying mechanism, which first conveying mechanism is arranged in the discharge area and comprises at least one endlessly circulating conveying member with conveying elements arranged thereon, wherein the at least one conveying member is deflected in each case at a first head end region on a first deflection device with a first deflection axis and at a second head end region, which is arranged at a distance in the conveying direction, on a second deflection device with a second deflection axis, wherein at least one of the deflection devices (11, 13) is in drive connection with a drive device, and the at least one conveying member forms an upper run and a lower run, and furthermore a circumferentially formed envelope with a conveying width is defined on the outside of the conveying elements, - a first conveyor housing, which first conveyor housing is arranged in the first head end region and covers the first deflection device, - a second conveyor housing, which second conveyor housing is arranged in the second head end region and covers the second deflection device - a second conveying mechanism, which second conveying mechanism is arranged in the second head end region and extends at least along the conveying width, - wherein the second conveying mechanism is received and arranged within the second conveyor housing and is arranged in a region below the second deflection axis of the second deflection device and outside the envelope defined on the outside by the conveying elements, and wherein a transfer region is defined between the first conveying mechanism and the second conveying mechanism, wherein the second conveying mechanism, as seen in its cross section, is arranged below the second deflection axis of the second deflection device and outside the envelope defined on the outside by the conveying elements, and - a supporting element, which supporting element is arranged below the lower run of the at least one endlessly circulating conveying member and extends between the first conveyor housing and the second conveyor housing and thereby defines a return conveying section extending between the two head end regions (9, 10), characterized in that the second conveying mechanism is received in a trough-shaped housing section of the second conveyor housing. - a receiving device, which receiving device is configured to be shaft-shaped or funnel-shaped and defines a supply area and a discharge area located on the bottom side, - a first conveying mechanism, which first conveying mechanism is arranged in the discharge area and comprises at least one endlessly circulating conveying member with conveying elements arranged thereon, wherein the at least one conveying member is deflected in each case at a first head end region on a first deflection device with a first deflection axis and at a second head end region, which is arranged at a distance in the conveying direction, on a second deflection device with a second deflection axis, wherein at least one of the deflection devices (11, 13) is in drive connection with a drive device, and the at least one conveying member forms an upper run and a lower run, and furthermore a circumferentially formed envelope with a conveying width is defined on the outside of the conveying elements, - a first conveyor housing, which first conveyor housing is arranged in the first head end region and covers the first deflection device, - a second conveyor housing, which second conveyor housing is arranged in the second head end region and covers the second deflection device - a second conveying mechanism, which second conveying mechanism is arranged in the second head end region and extends at least along the conveying width, - wherein the second conveying mechanism is received and arranged within the second conveyor housing and is arranged in a region below the second deflection axis of the second deflection device and outside the envelope defined on the outside by the conveying elements, and wherein a transfer region is defined between the first conveying mechanism and the second conveying mechanism, wherein the second conveying mechanism, as seen in its cross section, is arranged below the second deflection axis of the second deflection device and outside the envelope defined on the outside by the conveying elements, and - a supporting element, which supporting element is arranged below the lower run of the at least one endlessly circulating conveying member and extends between the first conveyor housing and the second conveyor housing and thereby defines a return conveying section extending between the two head end regions (9, 10),