US 12,258,983 B2
Hydraulic transmission unit for an actuator
Georg Bachmaier, Munich (DE); Matthias Gerlich, Munich (DE); Takeru Nemoto, Munich (DE); and Wolfgang Zoels, Munich (DE)
Assigned to MetisMotion GmbH, Munich (DE)
Appl. No. 17/604,136
Filed by MetisMotion GmbH, Munich (DE)
PCT Filed Apr. 17, 2019, PCT No. PCT/EP2019/059923
§ 371(c)(1), (2) Date Oct. 15, 2021,
PCT Pub. No. WO2020/211936, PCT Pub. Date Oct. 22, 2020.
Prior Publication US 2022/0205463 A1, Jun. 30, 2022
Int. Cl. F15B 7/08 (2006.01); F15B 7/10 (2006.01); F15B 7/00 (2006.01); F15B 7/02 (2006.01); F16D 25/08 (2006.01)
CPC F15B 7/08 (2013.01) [F15B 7/10 (2013.01); F15B 7/001 (2013.01); F15B 7/003 (2013.01); F15B 7/02 (2013.01); F15B 2211/7107 (2013.01); F16D 2025/081 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An actuator device comprising:
an actuator; and
a hydraulic transmission unit mechanically connected in series to the actuator, which hydraulic transmission unit can be filled with hydraulic fluid, comprising:
a first and a second chamber, which are hydraulically connected to each other and of which the first chamber is formed as a drive chamber and the second chamber is formed as an output chamber, the first chamber being coupled to the actuator,
wherein a first piston is arranged movably along a piston axis at least in the first chamber such that this first piston separates the first chamber into a variable-volume first working chamber and a first rear-side chamber,
wherein the first rear-side chamber is defined, at least in part, by a first lateral bounding wall that is subdivided into a first straight cylinder wall portion that axially transitions into a laterally delimiting first bellows element with variable axial length, the first straight cylinder wall portion and first bellows element collectively defining an outer boundary of the first rear-side chamber,
wherein a second piston is arranged movably along a piston axis in the second chamber such that this second piston separates the second chamber into a variable-volume second working chamber and a second rear-side chamber;
wherein the actuator device additionally comprises a reservoir chamber for the hydraulic fluid, which is fluidically coupled and/or capable of being fluidically coupled to at least one rear-side chamber;
wherein the actuator device further comprises a hydraulic line fluidically coupling the variable-volume first working chamber to the variable-volume second working chamber, the reservoir chamber being separate from the hydraulic line.