Hydraulic steering system

Patent metadata

Field	Value
Publication number	US-10161425-B2
Application number	US-201615092679-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Apr 8, 2015
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A hydraulic steering system (1) is provided having a steering device (2) and a symmetrically acting steering motor (3), said steering device (2) comprising a supply port arrangement having a high pressure port (P) and a low pressure port (T), a working port arrangement having two working ports (L, R), a control valve (14), two working lines (18, 19) each connecting said control valve (14) with one of said working ports (L, R), and a measuring motor (23). Such a hydraulic steering system should show a comfortable steering behavior. To this end said measuring motor (23) is arranged in one of said working lines (18, 19).

First claim

What is claimed is:

1. A hydraulic steering system having a steering device and a steering motor, said steering device comprising a supply port arrangement having a high pressure port (P) and a low pressure port (T), a working port arrangement having two working ports (L, R), a control valve, two working lines each connecting said control valve with one of said working ports (L, R), and a measuring motor, wherein said measuring motor is arranged in one of said working lines, wherein said high pressure port (P) and said low pressure port (T) are connected by means of a port check valve opening from said low pressure port (T) to said high pressure port (P), wherein releasable blocking means are located between said low pressure port (T) and said tank.

2. The hydraulic steering system according to claim 1 , wherein said control valve comprises a neutral position in which said two working lines are connected.

3. The hydraulic steering system according to claim 2 , wherein in said neutral position said high pressure port (P) and said low pressure port (T) are connected to each other via throttling means.

4. The hydraulic steering system according to claim 3 , wherein said throttling means comprise a first orifice between said high pressure port (P) and a connection of said two working lines.

5. The hydraulic steering system according to claim 4 , wherein said throttling means comprise a second orifice between said low pressure port (P) and said connection of said two working ports (L, R).

6. The hydraulic steering system according to claim 5 , wherein said measuring motor comprises two measuring motor ports, each measuring motor port being connected to said one of said working lines and each measuring motor port being connected to a tank via a respective check valve opening in a direction to said measuring motor port.

7. The hydraulic steering system according to claim 4 , wherein said measuring motor comprises two measuring motor ports, each measuring motor port being connected to said one of said working lines and each measuring motor port being connected to a tank via a respective check valve opening in a direction to said measuring motor port.

8. The hydraulic steering system according to claim 3 , wherein said measuring motor comprises two measuring motor ports, each measuring motor port being connected to said one of said working lines and each measuring motor port being connected to a tank via a respective check valve opening in a direction to said measuring motor port.

9. The hydraulic steering system according to claim 2 , wherein said measuring motor comprises two measuring motor ports, each measuring motor port being connected to said one of said working lines and each measuring motor port being connected to a tank via a respective check valve opening in a direction to said measuring motor port.

10. The hydraulic steering system according to claim 1 , wherein said measuring motor comprises two measuring motor ports, each measuring motor port being connected to said one of said working lines and each measuring motor port being connected to a tank via a respective check valve opening in a direction to said measuring motor port.

11. A hydraulic steering system having a steering device and a steering motor, said steering device comprising a supply port arrangement having a high pressure port (P) and a low pressure port (T), a working port arrangement having two working ports (L, R), a control valve, two working lines each connecting said control valve with one of said working ports (L, R), and a measuring motor, wherein said measuring motor is arranged in one of said working lines, wherein said measuring motor comprises two measuring motor ports, each measuring motor port being connected to said one of said working lines and each measuring motor port being connected to a tank via a respective check valve opening in a direction to said measuring motor port.

Assignees

• Danfoss Power Solutions Aps

Inventors

• Liljenberg Soeren
• Rudolph Tom
• Vester Jens
• Tychsen Tom
• Ennemark Poul

Classifications

• B62D5/097

  gerotor type · CPC title

• B62D5/093 Primary

  Telemotor driven by steering wheel movement (hydraulic steering gear B62D3/14) · CPC title

• F15B13/0401 Primary

  Valve members; Fluid interconnections therefor · CPC title

• B62D5/32

  for telemotor systems · CPC title

• F15B11/08

  with only one servomotor · CPC title