US 12,085,130 B2
Demagnetization control for transmission actuator
Kevin Rauh, Barberton, OH (US); and Nicholas Hrusch, Wooster, OH (US)
Assigned to Schaeffler Technologies AG &Co.KG, Herzogenaurach (DE)
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Filed on Oct. 13, 2022, as Appl. No. 17/965,096.
Application 16/897,838 is a division of application No. 16/142,011, filed on Sep. 26, 2018, granted, now 10,718,387, issued on Jul. 21, 2020.
Application 17/965,096 is a continuation in part of application No. 16/897,838, filed on Jun. 10, 2020, granted, now 11,519,465.
Claims priority of provisional application 63/309,320, filed on Feb. 11, 2022.
Prior Publication US 2023/0034641 A1, Feb. 2, 2023
Int. Cl. H01F 7/08 (2006.01); F04B 17/03 (2006.01); F16D 15/00 (2006.01); F16D 27/102 (2006.01); F16D 41/063 (2006.01); F16D 41/08 (2006.01); H02P 25/08 (2016.01); F04C 2/10 (2006.01); F04C 15/00 (2006.01)
CPC F16D 27/102 (2013.01) [F04B 17/03 (2013.01); F16D 15/00 (2013.01); F16D 41/063 (2013.01); F16D 41/082 (2013.01); H02P 25/08 (2013.01); F04C 2/105 (2013.01); F04C 15/008 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transmission actuator for a vehicle, comprising:
a fixed actuator housing;
a first rocker, rotatable in the fixed actuator housing, for engaging a toothed wheel to prevent rotation of the toothed wheel and a rotatable transmission component;
a second rocker, rotatable in the fixed actuator housing, for rotating the first rocker to engage the toothed wheel;
an engagement rod, linearly displaceable within the fixed actuator housing, for rotating the second rocker;
a solenoid arranged to displace the engagement rod, the solenoid comprising:
an iron core;
a wire coil wrapped around the iron core, the wire coil having a resistance and an inductance; and
a ferromagnetic plunger disposed radially inside the wire coil and arranged to linearly displace in a first direction when a first directional current is applied to the wire coil and arranged to linearly displace in a second direction, opposite the first direction, when a second directional current, opposite the first directional current, is applied to the wire coil; and
a solenoid control circuit arranged to:
supply the first directional current when the solenoid control circuit is energized by a power source; and
supply a decaying alternating current that includes the first directional current and the second directional current when the solenoid control circuit is de-energized from the power source.