Drive arrangement for the crop conveying and/or processing mechanism of a harvesting machine

A harvesting machine comprising:

• a crop conveying mechanism;
• a drive arrangement for driving the crop conveying mechanism including:
• a main drive engine (25);
• power transmission elements coupling the main drive engine to the crop conveying mechanism to drive the crop conveying mechanism in a first operating mode in a first direction with a first speed;
• and
• a reversible motor (86) coupled to the power transmission elements to drive the crop conveying mechanism in a second operating mode at a second speed in a second direction that differs from the first direction and to drive the crop conveying mechanism in a third operating mode in a first direction with a third speed that is lower than the first speed.

A harvesting machine comprising:

• a crop conveying mechanism;
• a drive arrangement for driving the crop conveying mechanism including:
• a main drive engine (25);
• power transmission elements coupling the main drive engine to the crop conveying mechanism to drive the crop conveying mechanism in a first operating mode in a first direction with a first speed;
• and
• a reversible motor (86) coupled to the power transmission elements to drive the crop conveying mechanism in a second operating mode at a second speed in a second direction that differs from the first direction, the reversible motor (86) being arranged in a fourth operating mode in which the crop conveying mechanism is separated from the main drive engine to operate as a brake.

A harvesting machine comprising:

• a crop conveying mechanism;
• a drive arrangement for driving the crop conveying mechanism including:
• a main drive engine (25);
• power transmission elements coupling the main drive engine to the crop conveying mechanism to drive the crop conveying mechanism in a first operating mode in a first direction with a first speed;
• and
• a reversible hydraulic motor (86) coupled to the power transmission elements to drive the crop conveying mechanism in a second operating mode at a second speed in a second direction that differs from the first direction, the drive arrangement can also be operated in third and fourth operating modes in which in the third operating mode the reversible motor (86) drives the crop conveying mechanism in a first direction with a third speed that is lower than the first speed, and in which in the fourth operating mode the drive arrangement is separated from the main drive engine and the reversible motor (86) operates as a brake for the crop conveying mechanism;
• the reversible motor (86) being in a hydraulic circuit having a first valve (104) that connects the reversible motor to a fluid pressure source (100) to operate the reversible motor in the first direction in the third operating mode and to operate the reversible motor in the second direction in the second operating mode and to block the reversible motor from the fluid pressure source (100) in the first and fourth operating modes, the hydraulic circuit having a second valve (106) that allows fluid flow through the circuit in the first, second and third operating modes and blocks fluid flow through the circuit in the fourth operating mode and the hydraulic circuit having a third valve (114) that connects the reversible motor (86) to a fluid reservoir (116) in the first and fourth operating modes.