EP 1055053 A4 20010117 - LUBRICATION SYSTEM FOR HYDRAULIC PUMPS
Title (en)
LUBRICATION SYSTEM FOR HYDRAULIC PUMPS
Title (de)
SCHMIERSYSTEM FÜR HYDRAULIKPUMPEN
Title (fr)
SYSTEME DE GRAISSAGE POUR POMPES HYDRAULIQUES
Publication
Application
Priority
- US 9922316 W 19990928
- US 16128998 A 19980928
Abstract (en)
[origin: WO0019067A2] In order to protect bearings which support the journals of pumping gears, hydraulic gear pumps have operating parameters restricted by temperature. Typically, these pumps do not operate at temperatures above about 210 DEG F. There is, however, a need for hydraulic gear pumps which can pump hydraulic fluid having a temperature which may be as high as about 250 DEG F without adversely affecting the bearings. In order to pump hydraulic fluid at these temperaturers, the present invention connects the return line of the system in which the pump is used to a lubrication chamber at one end of a journal supporting one of the pumping gears. The hydraulic fluid which has been cooled by the heat exchanger is then drawn by low pressure in a low pressure region of a pump inlet opening, through an interface between bearings supporting the gear journals and the gear journals themselves. In this way, bearings and gear journals are lubricated with hydraulic fluid having a temperature substantially lower than hydraulic fluid in a return line or tank.
[origin: WO0019067A2] The present invention connects a return line (44) of the system in which the pump (10) is used to a lubrication chamber (18) at one end of a journal (30) supporting one of the pumping gears (20) in order to pump high temperature hydraulic fluid. The hydraulic fluid which has been cooled by a heat exchanger (50) is then drawn by low pressure in a low pressure region (65) of a pump inlet opening (16), through an interface (60) between bearings (34) supporting the gear journals (30) and the gear journals themselves. In this way, bearings (34) and gear journals (30) are lubricated with hydraulic fluid having a temperature substantially lower than hydraulic fluid in a return line or tank.
IPC 1-7
IPC 8 full level
F01C 21/02 (2006.01); F04C 2/18 (2006.01); F04C 15/00 (2006.01); F16C 37/00 (2006.01); F16N 13/20 (2006.01); F16N 31/00 (2006.01); F16N 39/02 (2006.01)
CPC (source: EP)
F01C 21/02 (2013.01); F04C 2/18 (2013.01); F04C 15/0088 (2013.01); F04C 15/0096 (2013.01); F16N 13/20 (2013.01); F16N 39/02 (2013.01)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 0019067A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0019067 A2 20000406; WO 0019067 A3 20000928; WO 0019067 A9 20010104; WO 0019067 B1 20001109; CA 2309458 A1 20000406; EP 1055053 A2 20001129; EP 1055053 A4 20010117; JP 2002525529 A 20020813
DOCDB simple family (application)
US 9922316 W 19990928; CA 2309458 A 19990928; EP 99948470 A 19990928; JP 2000572491 A 19990928