Global Patent Index - EP 1040287 A1

EP 1040287 A1 2000-10-04 - CONTINUOUSLY VARIABLE AUTOMATIC TRANSMISSION

Title (en)

CONTINUOUSLY VARIABLE AUTOMATIC TRANSMISSION

Title (de)

STUFENLOSES AUTOMATGETRIEBE

Title (fr)

TRANSMISSION AUTOMATIQUE CONTINUE VARIABLE

Publication

EP 1040287 A1 (DE)

Application

EP 98965268 A

Priority

  • DE 19756685 A
  • EP 9808220 W

Abstract (en)

[origin: DE19756685A1] The invention relates to an automatic transmission for a motor vehicle, especially a continuously variable transmission. The transmission has a variator, a primary disk set (12) and a secondary disk set (10) having a pushing linked band, whereby the variator can be adjusted with transmission oil provided from an oil pump (3) via an electrohydraulically controlled pressure supply device. A pressure regulating device (1) is arranged in one of the pressure lines (4) of the pressure supply device leading from the oil pump (3). The pressure regulating device is configured with a control valve (2) which is located in the pressure line (4) and with a bypass line (5) which bypasses the control valve (2). A stepped piston (9) which is arranged in a cylinder housing (6) and which can be displaced between two path limiting devices (7, 8) is arranged in the bypass line (5). The piston borders a first cylinder space (14) with a first front face (13) and borders a second cylinder space (16) with a second front face (15) which faces opposite the direction of the oil pump (3), said second space having a cross-section which is smaller than the first cylinder space (14).

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

F16H 61/00

IPC 8 full level (invention and additional information)

F16H 9/00 (2006.01); F15B 3/00 (2006.01); F16H 61/00 (2006.01); F16H 61/662 (2006.01)

CPC (invention and additional information)

F16H 61/66272 (2013.01); F15B 3/00 (2013.01)

Citation (search report)

See references of WO 9932806A1

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

DE 19756685 A1 19990701; DE 19756685 C2 19991028; EP 1040287 A1 20001004; JP 2003517540 A 20030527; WO 9932806 A1 19990701

INPADOC legal status


2001-01-03 [18W] WITHDRAWN

- Date of withdrawal: 20001104

2000-11-22 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20001004

2000-10-04 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000317

2000-10-04 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT