Global patent index - EP 1055053 A4

EP 1055053 A4 2001-01-17 - 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

EP 1055053 A4 (EN)

Application

EP 99948470 A

Priority

  • US 9922316 W
  • US 16128998 A

Abstract (en)

[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.

[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.

IPC 1-7 (main, further and additional classification)

F01M 5/00; F04C 29/04; F16N 13/20

IPC 8 full level (invention and additional information)

F16C 37/00 (2006.01); F01C 21/02 (2006.01); F04C 2/18 (2006.01); F04C 15/00 (2006.01); F16N 13/20 (2006.01); F16N 31/00 (2006.01); F16N 39/02 (2006.01)

CPC (invention and additional information)

F16N 13/20 (2013.01); F01C 21/02 (2013.01); F04C 2/18 (2013.01); F04C 15/0088 (2013.01); F04C 15/0096 (2013.01); F16N 39/02 (2013.01)

Citation (search report)

  • No further relevant documents disclosed
  • See also references of WO 0019067A3

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

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

INPADOC legal status

2001-06-27 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20010427

2001-04-04 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: PARKER-HANNIFIN CORPORATION

- Ref Legal Event Code: RAP1

2001-01-17 [A4] SUPPLEMENTARY SEARCH REPORT

- Ref Legal Event Code: A4

- Effective date: 20001205

2001-01-17 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2001-01-17 [RIC1] CLASSIFICATION (CORRECTION)

- Ref Legal Event Code: RIC1

- Free Format Text: 7F 01M 5/00 A, 7F 16N 13/20 B, 7F 04C 29/04 B

2000-12-20 [RIC1] CLASSIFICATION (CORRECTION)

- Ref Legal Event Code: RIC1

- Free Format Text: 7F 01M 5/00 A

2000-11-29 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000927

2000-11-29 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE