초록

A harvesting head (104) for an agricultural combine (100) includes a hydraulic height control circuit for controlling the height of the reel (122). The hydraulic height control circuit includes at least two closed hydraulic circuits (124, 134 and 128, 138).

대표청구항 ▼

The invention claimed is: 1. A harvesting head for an agricultural combine, the harvesting head comprising:a frame (106) that extends laterally and has a leading edge;a conveyor means (108, 110, 112) mounted on the frame (106) to carry cut crop to a feederhouse (102) of the agricultural combine;a re

The invention claimed is: 1. A harvesting head for an agricultural combine, the harvesting head comprising:a frame (106) that extends laterally and has a leading edge;a conveyor means (108, 110, 112) mounted on the frame (106) to carry cut crop to a feederhouse (102) of the agricultural combine;a reciprocating knife (132) fixed to a leading edge of the frame (106);a reel (122) disposed above the reciprocating knife (132) to convey crop material to the conveyor means (108, 110, 112);at least first, second and third reel support arms (114), (116) and (118), respectively, being coupled between said frame (106) and said reel (122);at least first and second hydraulic cylinders (124) and (128), respectively, having first ends pivotally coupled to first and a second ones (114, 118) of said reel support arms (114, 116, 118) and having second ends pivotally coupled to said frame (106) to support and vertically position the reel (122);at least a third hydraulic cylinder (134) and a fourth hydraulic cylinder (138); anda hydraulic height control circuit comprising at least first and second closed hydraulic circuits respectively including said third hydraulic cylinder (134) being hydraulically coupled to said first hydraulic cylinder (124) for effecting extension and retraction of said first hydraulic cylinder (124), and including said fourth hydraulic cylinder 138 being hydraulically coupled to said second hydraulic cylinder (128) for effecting extension and retraction of said second hydraulic cylinder (128), with said extension and retraction of said first and second hydraulic cylinders (124) and (128), respectively effecting raising and lowering of said first and second ones (114) and (116) of the first, second and third reel support arms (114, 116, 118).