US 11,746,801 B2
Hydraulic device, a hydraulic system and a working machine
Mika Sahlman, Tampere (FI); and Kim Heybroek, Kvicksund (SE)
Assigned to Volvo Construction Equipment AB, Eskilstuna (SE)
Appl. No. 17/606,035
Filed by Volvo Construction Equipment AB, Eskilstuna (SE); and Norrhydro Oy, Rovaniemi (FI)
PCT Filed Apr. 24, 2019, PCT No. PCT/EP2019/060441
§ 371(c)(1), (2) Date Oct. 24, 2021,
PCT Pub. No. WO2020/216440, PCT Pub. Date Oct. 29, 2020.
Prior Publication US 2022/0205461 A1, Jun. 30, 2022
Int. Cl. F15B 1/027 (2006.01); E02F 9/22 (2006.01); F15B 1/26 (2006.01)
CPC F15B 1/027 (2013.01) [E02F 9/2289 (2013.01); F15B 1/265 (2013.01); E02F 9/2217 (2013.01); E02F 9/2292 (2013.01); F15B 2211/20569 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/212 (2013.01); F15B 2211/625 (2013.01); F15B 2211/7135 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A hydraulic device for a hydraulic system, the hydraulic device comprising:
a chamber arrangement comprising at least one high-pressure chamber for connection to a high-pressure side of the hydraulic system, at least one low-pressure chamber for connection to a low-pressure side of the hydraulic system, and at least one tank chamber for connection to a tank-pressure side of the hydraulic system;
a movable member arranged to reciprocate at least partly inside the chamber arrangement in response to pressure variations within the at least one high-pressure chamber and within the at least one low-pressure chamber; and
a housing, wherein the at least one high-pressure chamber, the at least one low-pressure chamber and the at least one tank chamber are provided inside the housing, and the at least one tank chamber is limited by a wall of the housing.
 
13. A hydraulic system for a working machine, the hydraulic system comprising:
a high-pressure side arranged to both produce and receive a volume flow at a first pressure level;
a low-pressure side arranged to both produce and receive a volume flow at a second pressure level lower than the first pressure level;
a tank-pressure side; and
a hydraulic device comprising:
a chamber arrangement comprising at least one high-pressure chamber for connection to the high-pressure side, at least one low-pressure chamber for connection to the low-pressure side, and at least one tank chamber for connection to the tank-pressure side; and
a movable member arranged to reciprocate at least partly inside the chamber arrangement in response to pressure variations within the at least one high-pressure chamber and within the at least one low-pressure chamber.
 
18. A hydraulic device for a hydraulic system, the hydraulic device comprising:
a chamber arrangement comprising at least one high-pressure chamber for connection to a high-pressure side of the hydraulic system, at least one low-pressure chamber for connection to a low-pressure side of the hydraulic system, and at least one tank chamber for connection to a tank-pressure side of the hydraulic system;
a movable member arranged to reciprocate at least partly inside the chamber arrangement in response to pressure variations within the at least one high-pressure chamber and within the at least one low-pressure chamber; and
at least one high-pressure hydraulic energy storage for connection to the high-pressure side, wherein the at least one high-pressure hydraulic energy storage is arranged inside one of the at least one tank chamber or inside one of the at least one low-pressure chamber.