Gearbox

Abstract

A hydraulic pump arrangement ( 1 ), has a hydraulic pump ( 2 ) with two flow directions. The hydraulic pump ( 2 ) has a first hydraulic port ( 3 ) and a second hydraulic port 4 . A first feed line ( 5 ) and a first discharge line ( 6 ) are, both connected to the first hydraulic port ( 3 ). A second feed line ( 7 ) and a second discharge line ( 8 ), are both connected to the second hydraulic port ( 4 ). A non-return valve ( 9, 10, 11, 12 ) is arranged in each feed line ( 5, 7 ) and in each discharge line ( 6, 8 ).

What is claimed is: 
     
         1 . A gearbox, comprising:
 a hydraulic pump with two flow directions, the hydraulic pump includes a first hydraulic port and a second hydraulic port,   a first feed line and a first discharge line are both connected to the first hydraulic port; and   a second feed and a second discharge are both connected to the second hydraulic port;   a non-return valve is arranged in each feed line and in each discharge line, the feeds are connected to an oil sump of the gearbox;   a gear box drive shaft drives the hydraulic pump, the drive shaft of the gearbox includes at least one gear;   a gearbox housing includes a housing bottom, wherein the oil sump is arranged in the housing bottom;   an accommodation chamber is provided in the housing bottom for accommodating the gear of the drive shaft, the accommodation chamber separates the oil sump into a first sump chamber and into a second sump chamber; and   the first feed line of the hydraulic pump arrangement is connected to the first sump chamber and the second feed line of the hydraulic pump arrangement is connected to the second sump chamber.   
     
     
         2 . The gearbox according to  claim 1 , wherein the non-return valves in the feed lines open in the direction to the respective hydraulic port and the non-return valves in the discharge lines close in the direction to the respective hydraulic port. 
     
     
         3 . The gearbox according to  claim 1 , wherein the first discharge line and the second discharge line are connected to a joint discharge line. 
     
     
         4 . The gearbox according to  claim 1 , wherein the hydraulic pump is a gear pump, a vane pump or a piston pump. 
     
     
         5 . The gearbox according to  claim 1 , wherein the hydraulic pump has a pump housing, that is detachably connected to the gearbox housing. 
     
     
         6 . The gearbox according to  claim 5 , wherein the pump housing has two inlet openings that are connected to bores leading into the sump chambers in the gearbox housing and the non-return valves of the feed lines are arranged in the bores of the gearbox housing. 
     
     
         7 . The gearbox according to  claim 1 , wherein the hydraulic pump further comprises an inlet module, a pump module and an outlet module, the modules are detachably connected to each other, and connection passages are provided in the inlet module as part of the feed lines, the connection passages extend from inlets to the hydraulic pump, the hydraulic pump is provided in the pump module and connection passages are provided in the outlet module as part of the discharge lines, the connection passages extend from the hydraulic pump to a discharge line. 
     
     
         8 . The gearbox according to  claim 7 , wherein a pump drive shaft for driving the hydraulic pump is passed from the pump module through the inlet module. 
     
     
         9 . The gearbox according to  claim 8 , wherein the pump drive shaft is passed through a through bore in the gearbox housing and is, drive-wise, detachably connected within the gearbox housing to the drive shaft. 
     
     
         10 . A gearbox, comprising:
 a hydraulic pump,   a first feed line and a second feed line both feeding oil to the hydraulic pump, the feed lines are connected to an oil sump of the gearbox,   a gearbox drive shaft drives the hydraulic pump, the drive shaft of the gearbox includes at least one gear,   a gearbox housing has a housing bottom, the oil sump is arranged in the housing bottom,   an accommodation chamber is provided in the housing bottom to accommodate the gear of the drive shaft, the accommodation chamber separates the oil sump into a first sump chamber and a second sump chamber,   the first feed line is connected to the first sump chamber and the second feed line is connected to the second sump chamber.   
     
     
         11 . The gearbox according to  claim 10 , wherein the hydraulic pump has two flow directions and a first hydraulic port and a second hydraulic port,
 the first feed line and a first discharge line are both connected to the first hydraulic port and   the second feed line and second discharge line are both connected to the second hydraulic port, and   a non-return valve is arranged in each feed line and in each discharge line.