US 11,746,902 B2
Device for actuating a parking lock means of an automatic transmission and method for operating such a device
Thomas Schwegler, Tettnang (DE); Sven Jabs, Langenargen (DE); Andreas Bisping, Friedrichshafen (DE); and Florian Weinl, Bodolz (DE)
Assigned to ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
Appl. No. 17/604,232
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
PCT Filed Mar. 20, 2020, PCT No. PCT/EP2020/057845
§ 371(c)(1), (2) Date Oct. 15, 2021,
PCT Pub. No. WO2020/212076, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 10 2019 205 596.6 (DE), filed on Apr. 17, 2019.
Prior Publication US 2022/0205535 A1, Jun. 30, 2022
Int. Cl. F16H 63/34 (2006.01); F16H 61/12 (2010.01); F16H 63/48 (2006.01); B60T 1/00 (2006.01)
CPC F16H 63/3483 (2013.01) [B60T 1/005 (2013.01); F16H 61/12 (2013.01); F16H 63/3433 (2013.01); F16H 63/48 (2013.01); F16H 2061/1224 (2013.01); F16H 2061/1288 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device (1) for actuating a parking lock device (2) of an automatic transmission, comprising:
a piston (3) guided in a cylinder (5) and hydraulically displaceable counter to a spring force of an actuation spring (4);
a blocking device (15) comprising radially displaceable blocking elements (26), the piston (3) bringable into an operative connection with a parking pawl (13), the piston (3) form-lockingly fixable by the radially displaceable blocking elements (26) of the blocking device (15) both in a first position corresponding to an engaged operating condition of the parking lock device (2) and in a second position corresponding to a disengaged operating condition of the parking lock device (2); and
an actuation element (17), the blocking elements (26) radially displaceable by the actuation element (17),
wherein a radial displacement path of the blocking elements (26) in the first position of the piston (3) and a corresponding operating condition of the actuation element (17) deviate from the radial displacement path of the blocking elements (26) in the second position of the piston (3) and the corresponding operating condition of the actuation element (17),
wherein the blocking elements (26) are configured as balls that are axially and radially guided in recesses (34) of a guide sleeve (35) operatively connected to the cylinder (5).