Hydraulic steering unit

Patent metadata

Field	Value
Publication number	US-10723378-B2
Application number	US-201815970211-A
Country	US
Kind code	B2
Filing date	May 3, 2018
Priority date	May 8, 2017
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A hydraulic steering unit (1) is described comprising a supply port arrangement having a pressure port (8) connected to a main flow path (2) and a tank port (5) connected to a tank flow path (3), a working port arrangement having a left working port (L) connected to a left working flow path (4) and a right working port (R) connected to a right working flow path (5), a variable first left orifice (A2L) connected to the main flow path (2) and to the left working flow path (4), a variable first right orifice (A2R) connected to the main flow path (2) and to the right working flow path (5), a variable second left orifice (A3L) connected to the left working flow path (4) and to the tank flow path (3), and a variable second right orifice (A3R) connected to the right working flow path (5) and to the tank flow path (3). Such a steering unit should allow comfortable steering. To this end a measuring motor (15) is arranged in one of the working flow parts (4, 5).

First claim

The invention claimed is:

1. A hydraulic steering unit comprising a supply port arrangement having a pressure port connected to a main flow path and a tank port connected to a tank flow path, a working port arrangement having a left working port (L) connected to a left working flow path and a right working port (R) connected to a right working flow path, a variable first left orifice (A 2 L) connected to the main flow path and to the left working flow path, a variable first right orifice (A 2 R) connected to the main flow path and to the right working flow path, a variable second left orifice (A 3 L) connected to the left working flow path and to the tank flow path, and a variable second right orifice (A 3 R) connected to the right working flow path and to the tank flow path, wherein a measuring motor is arranged in one of the working flow paths, and
wherein a variable third left orifice (A 4 L) is arranged in the left working flow path and a variable third right orifice (A 4 R) is arranged in the right working flow path.

2. The hydraulic steering unit according to claim 1 , wherein a variable main orifice (A 1 ) is arranged in the main flow path upstream the variable first left orifice (A 2 L) and the variable first right orifice (A 2 R).

3. The hydraulic steering unit according to claim 2 , wherein the main orifice (A 1 ) is closed in a neutral position of the steering unit.

4. The hydraulic steering unit according claim 3 , wherein a tank orifice (A 10 ) is arranged in the tank flow path.

5. The hydraulic steering unit according to claim 2 , wherein the main orifice (A 1 ) has a minimum opening in the neutral position of the steering unit.

6. The hydraulic steering unit according claim 5 , wherein a tank orifice (A 10 ) is arranged in the tank flow path.

7. The hydraulic steering unit according claim 2 , wherein a tank orifice (A 10 ) is arranged in the tank flow path.

8. The hydraulic steering unit according to claim 1 , wherein a tank orifice (A 10 ) is arranged in the tank flow path.

9. The hydraulic steering unit according to claim 8 , wherein the tank orifice (A 10 ) is a variable orifice.

10. The hydraulic steering unit according to claim 1 , wherein the variable third left orifice (A 4 L) and the variable third right orifice (A 4 R) open faster than the variable first left orifice (A 2 L) and the variable first right orifice (A 2 R).

11. A hydraulic steering unit comprising a supply port arrangement having a pressure port connected to a main flow path and a tank port connected to a tank flow path, a working port arrangement having a left working port (L) connected to a left working flow path and a right working port (R) connected to a right working flow path, a variable first left orifice (A 2 L) connected to the main flow path and to the left working flow path, a variable first right orifice (A 2 R) connected to the main flow path and to the right working flow path, a variable second left orifice (A 3 L) connected to the left working flow path and to the tank flow path, and a variable second right orifice (A 3 R) connected to the right working flow path and to the tank flow path, wherein a measuring motor is arranged in one of the working flow paths,
wherein a variable main orifice (A 1 ) is arranged in the main flow path upstream the variable first left orifice (A 2 L) and the variable first right orifice (A 2 R), and
wherein the main orifice (A 1 ) has a minimum opening in the neutral position of the steering unit.

12. The hydraulic steering unit according to claim 11 , wherein a variable third left orifice (A 4 L) is arranged in the left working flow path and a variable third right orifice (A 4 R) is arranged in the right working flow path.

13. The hydraulic steering unit according to claim 12 , wherein the variable third left orifice (A 4 L) and the variable third right orifice (A 4 R) open faster than the variable first left orifice (A 2 L) and the variable first right orifice (A 2 R).

14. The hydraulic steering unit according claim 11 , wherein a tank orifice (A 10 ) is arranged in the tank flow path.

15. The hydraulic steering unit according to claim 14 , wherein the tank orifice (A 10 ) is a variable orifice.

Assignees

• Danfoss Power Solutions Aps

Inventors

• Arbjerg Niels
• Bates Charles Anthony
• Ennemark Poul
• Frederiksen Mogens
• Olesen Casper Mikael

Classifications

• B62D5/093 Primary

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

• B62D5/08

  characterised by type of {steering} valve used (valves in general F16K) · CPC title

• B62D5/06 Primary

  fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle · CPC title

• B62D5/065 Primary

  characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist · CPC title

• B62D5/14

  Rotary motor · CPC title