Hydraulic steering unit

Patent metadata

Field	Value
Publication number	US-10895328-B2
Application number	US-201916524747-A
Country	US
Kind code	B2
Filing date	Jul 29, 2019
Priority date	Jul 30, 2018
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A hydraulic steering unit is described comprising a housing (1) and a non-return valve (2) having a ball (3) and a valve seat (4) at an end of a channel (5) in the housing (1), wherein a movement of the ball (3) away from the valve seat (4) is limited by an abutment (7) in the channel (5). Such a steering unit should have a non-return valve which can be produced with low costs. To this end the abutment (7) extends transversely through the channel.

First claim

What is claimed is:

1. A hydraulic steering unit comprising a housing, a non-return valve having a ball and a first valve seat at an end of a channel in the housing, and a valve extending transversely through the channel, the valve having a guiding stem, a head, a second valve seat, and a spring surrounding the guiding stem, wherein a movement of the ball away from the first valve seat is limited by a side portion of the guiding stem and/or spring extending transversely through the channel.

2. The hydraulic steering unit according to claim 1 , wherein both ends of the valve are held in the housing.

3. The hydraulic steering unit according to claim 1 , wherein the valve is arranged out of a center line of the channel.

4. The hydraulic steering unit according to claim 1 , wherein the valve is a check-valve.

5. The hydraulic steering unit according to claim 4 , wherein the side portion is formed by at least a moveable part of the check-valve.

6. The hydraulic steering unit according to claim 4 , wherein the head is loaded by the spring in a direction towards the second valve seat and the spring limits the movement of the ball away from the first valve seat.

7. The hydraulic steering unit according to claim 6 , wherein in a closed state of the check-valve the abutment side portion limiting movement of the ball away from the first valve seat is formed by the spring only and in an open state of the check-valve the side portion limiting movement of the ball away from the first valve seat is formed additionally by the guiding stem.

8. The hydraulic steering unit according to claim 6 , wherein the guiding stem is guided in the housing and in a valve seat element which is fixed in the housing, the valve seat element comprising the second valve seat.

9. The hydraulic steering unit according to claim 6 , wherein the guiding stem comprises a stem having a tapered section and the spring is arranged at least partly around the tapered section.

10. The hydraulic steering unit according to any of claim 6 , wherein the spring rests against the head, wherein in a closed state of the check-valve at least part of the head check-valve at least part of the protrusion is in a position out of the channel.

11. The hydraulic steering unit according to claim 2 , wherein the valve is arranged out of a center line of the channel.

12. The hydraulic steering unit according to claim 2 , wherein the valve is by a check-valve.

13. The hydraulic steering unit according to claim 3 , wherein the valve is by a check-valve.

14. The hydraulic steering unit according to claim 5 , wherein the valve head is loaded by the spring in a direction towards the second valve seat and the spring limits the movement of the ball away from the first valve seat.

15. The hydraulic steering unit according to claim 7 , wherein the guiding stem is guided in the housing and in a valve seat element which is fixed in the housing, the valve seat element comprising the second valve seat.

16. The hydraulic steering unit according to claim 7 , wherein the guiding stem comprises a stem having a tapered section and the spring is arranged at least partly around the tapered section.

17. The hydraulic steering unit according to claim 8 , wherein the guiding stem comprises a stem having a tapered section and the spring is arranged at least partly around the tapered section.

18. The hydraulic steering unit according to claim 7 , wherein the spring rests against the head, wherein in a closed state of the check-valve at least part of the head is in a position out of the channel.

19. The hydraulic steering unit according to claim 8 , wherein the spring rests against the head, wherein in a closed state of the check-valve at least part of the head is in a position out of the channel.

20. The hydraulic steering unit according to claim 9 , wherein the spring rests against the head, wherein in a closed state of the check-valve at least part of the head is in a position out of the channel.

Assignees

• Danfoss Power Solutions Aps

Inventors

• Sevelsted Nils E
• Liu Ylnghui

Classifications

• F16K15/04

  shaped as balls · CPC title

• B62D3/14

  hydraulic · CPC title

• B62D5/32

  for telemotor systems · CPC title

• F16K15/044 Primary

  spring-loaded · CPC title

• B62D5/062 Primary

  Details, component parts · CPC title