Global Patent Index - EP 1098799 A1

EP 1098799 A1 2001-05-16 - BRAKE SERVO UNIT

Title (en)

BRAKE SERVO UNIT

Title (de)

BREMSKRAFTVERSTÄRKER

Title (fr)

SERVOFREIN

Publication

EP 1098799 A1 (DE)

Application

EP 00934930 A

Priority

  • DE 0001293 W
  • DE 19919872 A

Abstract (en)

[origin: DE19919872A1] The invention relates to a brake servo unit (1) for a motor vehicle, comprising a brake servo unit housing (2), at least one vacuum negative-pressure chamber (13) and at least one additional pressure chamber (14), which can be prevailed upon by an ambient pressure whenever an actuating pedal for the brake assembly of the vehicle is operated. The negative-pressure chamber and the pressure chamber are separated from one another by a displaceable piston (9). According to the invention, the brake servo unit has at least one additional vacuum negative-pressure chamber (17) which can be connected to the pressure chamber, using a shifting device (18). The inventive configuration provides the necessary negative pressure, in order to operate the brake servo unit for a sufficient number of braking procedures, even when used with motor vehicle engines which can no longer provide the necessary negative pressure for normal operation of a brake servo unit. The inventive configuration can be constructed within the construction space available in conventional brake servo units and thus requires only minimal additional costs.

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

B60T 13/52; B60T 13/567

IPC 8 full level (invention and additional information)

B60T 13/52 (2006.01); B60T 13/567 (2006.01); B60T 17/00 (2006.01)

CPC (invention and additional information)

B60T 13/52 (2013.01); B60T 13/567 (2013.01)

Citation (search report)

See references of WO 0066409A1

Designated contracting state (EPC)

ES FR GB IT SE

EPO simple patent family

DE 19919872 A1 20001109; DE 19919872 C2 20010315; BR 0006062 A 20010320; EP 1098799 A1 20010516; JP 2002542985 A 20021217; US 6431047 B1 20020813; WO 0066409 A1 20001109

INPADOC legal status


2006-05-03 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20051028

2005-08-03 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20050617

2004-06-24 [REG DE 8566] DESIGNATED COUNTRY DE NOT LONGER VALID

2004-05-19 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): ES FR GB IT SE

2001-05-16 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010131

2001-05-16 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

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