Hydraulic steering unit for a boat drive and boat drive with such a steering unit

US12240584B2 · kind B2 · utility

Assignee

• HAWE Hydraulik SE · DE

Inventors

• Paul Franz · Lengenwang, DE
• Florian Mayr · Kerschlach, DE
• Jürgen Osterried · Pfronten, DE
• Michael Stegmüller · Marktoberdorf, DE
• Markus Weiss · Aalen, DE

Key dates

• Filing date: Apr 21, 2022
• Grant date: Mar 4, 2025
• Expiry date: Sep 23, 2043

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B63H20/12
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A boat drive hydraulic steering unit has a steering cylinder unit, pump and tank. The cylinder unit has a first chamber, piston and second chamber. The pump is connected to the first and second chambers by respective first and second line. The first chamber is connected to the tank via the first line arrangement when the second chamber is pressurized, by the first line arrangement having a first check valve which opens when the second line arrangement is pressurized. The second chamber is connected to the tank via the second line arrangement when the first chamber is pressurized, by the second line arrangement having a second check valve which opens when the first line arrangement is pressurized. The first and second line arrangements have respective first and second throttling devices acting in the direction of flow towards the tank. A boat drive may include the steering unit.