US 11,919,489 B2
Master cylinder arrangement for a brake system
Kristijan Tarandek, Neu-Isenburg (DE); Hans-Jörg Feigel, Rosbach (DE); I-Che Chiang, Frankfurt am Main (DE); and Priti Kumari, Frankfurt am Main (DE)
Assigned to HL MANDO CORPORATION, Pyeongtaek (KR)
Appl. No. 17/413,616
Filed by HL MANDO CORPORATION, Pyeongtaek-si (KR)
PCT Filed Dec. 16, 2019, PCT No. PCT/KR2019/017834
§ 371(c)(1), (2) Date Jun. 14, 2021,
PCT Pub. No. WO2020/122691, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. 10 2018 221 779.3 (DE), filed on Dec. 14, 2018.
Prior Publication US 2022/0041149 A1, Feb. 10, 2022
Int. Cl. B60T 11/20 (2006.01); B60T 7/04 (2006.01); B60T 8/40 (2006.01); B60T 13/14 (2006.01); B60T 13/68 (2006.01); B60T 13/74 (2006.01); B60T 17/22 (2006.01); F15B 13/14 (2006.01)
CPC B60T 11/20 (2013.01) [B60T 7/042 (2013.01); B60T 8/409 (2013.01); B60T 13/14 (2013.01); B60T 13/686 (2013.01); B60T 13/745 (2013.01); B60T 17/22 (2013.01); B60T 2220/04 (2013.01); B60T 2270/406 (2013.01); F15B 13/14 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A master cylinder arrangement for a brake system, comprising a tandem master cylinder including a master cylinder housing, a first master piston movably arranged in the master cylinder housing, a second master piston movably arranged in the master cylinder housing, a balancing piston movably arranged in the second master piston, and an elastic pedal feel element,
wherein the master cylinder housing encloses a first master chamber and a second master chamber, the first master piston being directly displaceable by operating a brake pedal and the second master piston being a floating piston and separating the first master chamber, which is between the first master piston and the second master piston, from the second master chamber, the elastic pedal feel element being arranged in the first master chamber to be in contact with the first master piston and the second master piston for generating a pedal force when the brake pedal is operated while the second master piston is locked in a normal operating mode,
wherein the second master piston encloses a balancing chamber, the balancing piston separating the balancing chamber from the second master chamber and the balancing chamber being hydraulically connected to the first master chamber via a balancing path for balancing a first hydraulic pressure in the first master chamber and a second hydraulic pressure in the second master chamber when the second master piston is unlocked in an emergency operating mode,
wherein a first ventilation channel is provided in a piston wall of the second master piston, the first ventilation channel hydraulically connecting the balancing chamber to a first inlet for brake fluid supply in a rest position of the second master piston so that the first master chamber is hydraulically connected to the first inlet via the balancing path and the first ventilation channel, wherein a first cut-off valve is arranged in the balancing path for blocking the balancing path in a test mode of the master cylinder arrangement.