US 12,240,584 B2
Hydraulic steering unit for a boat drive and boat drive with such a steering unit
Paul Franz, Lengenwang (DE); Florian Mayr, Pähl-Fischen (DE); Jürgen Osterried, Pfronten (DE); Michael Stegmüller, Marktoberdorf (DE); and Markus Weiss, Bertoldshofen (DE)
Assigned to HAWE Hydraulik SE, Aschheim (DE)
Filed by HAWE Hydraulik SE, Aschheim (DE)
Filed on Apr. 21, 2022, as Appl. No. 17/725,751.
Claims priority of application No. 102021204032.2 (DE), filed on Apr. 22, 2021.
Prior Publication US 2022/0340249 A1, Oct. 27, 2022
Int. Cl. B63H 25/46 (2006.01)
CPC B63H 25/46 (2013.01) 19 Claims
OG exemplary drawing
 
1. A hydraulic steering unit for a boat drive, comprising:
at least one steering cylinder unit having a first piston chamber, a cylinder piston unit and a second piston chamber separated from the first piston chamber by the cylinder piston unit;
at least one pump connected to the first piston chamber via a first line arrangement and to the second piston chamber via a second line arrangement;
a tank;
the first piston chamber being connected to the tank via the first line arrangement when the second piston chamber is pressurized, in that the first line arrangement has a first check valve which is opened when the second line arrangement is pressurized; and
the second piston chamber being connected to the tank via the second line arrangement when the first piston chamber is pressurized, in that the second line arrangement has a second check valve which is opened when the first line arrangement is pressurized;
wherein:
the first line arrangement has a first throttling device acting in a direction of flow to the tank;
the second line arrangement has a second throttling device acting in a direction of flow to the tank;
the first throttling device comprises a first hydraulic resistor;
the first hydraulic resistor is a first nozzle;
the first nozzle is an adjustable nozzle in a closing direction and an opening direction;
a first control line branches off from the second line arrangement and acts on the first nozzle in the opening direction; and
a second control line branches off from the first line arrangement between the first piston chamber and the first nozzle and acts on the first nozzle in the closing direction.