Pressure-limiting valve

Patent metadata

Field	Value
Publication number	US-9228667-B2
Application number	US-201214114745-A
Country	US
Kind code	B2
Filing date	Mar 8, 2012
Priority date	Apr 29, 2011
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A pressure-limiting valve is proposed, in particular for a common rail system. The pressure-limiting valve comprises a valve support ( 10 ), a valve insert ( 12 ) which is connected to the valve support ( 10 ), a valve piston ( 14 ) which is mounted such that it can slide in the valve insert ( 12 ), and a closing spring ( 16 ) which acts on the valve piston ( 14 ) with a closing force in the closing direction. By means of the closing force, the valve piston ( 14 ) acts on a valve seat ( 18 ) which produces a hydraulic connection via a valve chamber ( 40 ) between a high-pressure space ( 33 ) and a low-pressure space ( 36 ), as soon as the hydraulic force which acts on the valve piston ( 14 ) in the opening direction exceeds the closing force of the closing spring ( 16 ). When the valve seat ( 18 ) is closed, a leakage gap ( 50 ) is formed between the valve chamber ( 40 ) and the low-pressure space ( 36 ), which leakage gap ( 50 ) makes it possible for the leakage to be discharged out of the valve chamber ( 40 ) into the low-pressure space ( 36 ).

First claim

What is claimed is:

1. A pressure-limiting valve, comprising a valve support ( 10 ), a valve insert ( 12 ) which is connected to the valve support ( 10 ), a valve piston ( 14 ) which is mounted such that the valve piston can slide in the valve insert ( 12 ) in a guide bore ( 13 ) and a closing spring ( 16 ) which acts on the valve piston ( 14 ) with a closing force in a closing direction, and the valve piston ( 14 ) acts on a valve seat ( 18 ) by means of the closing force, said valve seat producing a hydraulic connection via a valve chamber ( 40 ) between a high-pressure space ( 33 ) and a low-pressure space ( 36 ), as soon as a hydraulic force which acts on the valve piston ( 14 ) in an opening direction exceeds the closing force of the closing spring ( 16 ), wherein a leakage gap ( 50 ) is formed between the valve chamber ( 40 ) and the low-pressure space ( 36 ) when the valve seat ( 18 ) is closed, wherein the leakage gap ( 50 ) enables leakage to be discharged out of the valve chamber ( 40 ) into the low-pressure space ( 36 ), wherein the leakage gap ( 50 ) is formed by a first leakage connection ( 51 ) on a valve chamber side of the pressure-limiting valve and a second leakage connection ( 52 ) on a low-pressure side of the pressure-limiting valve, wherein the first leakage connection ( 51 ) is formed by a radial relief groove ( 44 ), and wherein the second leakage connection ( 52 ) is formed by an axial relief channel ( 46 ) which connects the radial relief groove ( 44 ) to the low-pressure space ( 36 ).

2. The pressure-limiting valve according to claim 1 , wherein the leakage gap ( 50 ) is formed in a guide section ( 41 ) between the guide bore ( 13 ) and the valve piston ( 14 ).

3. The pressure-limiting valve according to claim 1 , wherein at least one flat spot ( 42 ) embodied on the valve piston ( 14 ) is guided into the radial relief groove ( 44 ) when the valve seat ( 18 ) is closed.

4. The pressure-limiting valve according to claim 3 , wherein the radial relief groove ( 44 ) is embodied in a circumferential manner on an inside of the guide bore ( 13 ) in the guide section ( 41 ).

5. The pressure-limiting valve according to claim 1 , wherein the axial relief channel ( 46 ) is formed by at least one of a flattened section embodied on the valve piston ( 14 ) and an axial groove ( 47 ) in the valve piston ( 14 ).

6. A pressure-limiting valve, comprising a valve support ( 10 ), a valve insert ( 12 ) which is connected to the valve support ( 10 ), a valve piston ( 14 ) which is mounted such that the valve piston can slide in the valve insert ( 12 ) in a guide bore ( 13 ) and a closing spring ( 16 ) which acts on the valve piston ( 14 ) with a closing force in a closing direction, and the valve piston ( 14 ) acts on a valve seat ( 18 ) by means of the closing force, said valve seat producing a hydraulic connection via a valve chamber ( 40 ) between a high-pressure space ( 33 ) and a low-pressure space ( 36 ), as soon as a hydraulic force which acts on the valve piston ( 14 ) in an opening direction exceeds the closing force of the closing spring ( 16 ), wherein a leakage gap ( 50 ) is formed between the valve chamber ( 40 ) and the low-pressure space ( 36 ) when the valve seat ( 18 ) is closed, wherein the leakage gap ( 50 ) enables leakage to be discharged out of the valve chamber ( 40 ) into the low-pressure space ( 36 ), and wherein the valve piston ( 14 ) has three flat spots ( 42 ) evenly distributed over a circumference thereof.

7. The pressure-limiting valve according to claim 6 , wherein the leakage gap ( 50 ) is formed in a guide section ( 41 ) between the guide bore ( 13 ) and the valve piston ( 14 ).

8. The pressure-limiting valve according to claim 6 , wherein the leakage gap ( 50 ) is formed by a first leakage connection ( 51 ) on a valve chamber side and a second leakage connection ( 52 ) on a low-pressure side.

9. The pressure-limiting valve according to claim 8 , wherein the first leakage connection ( 51 ) on the valve chamber side is formed by a radial relief groove ( 44 ), into which at least one flat spot ( 42 ) embodied on the valve piston ( 14 ) is guided when the valve seat ( 18 ) is closed.

10. The pressure-limiting valve according to claim 9 , wherein the radial relief groove ( 44 ) is embodied in a circumferential manner on an inside of the guide bore ( 13 ) in the guide section ( 41 ).

11. The pressure-limiting valve according to claim 9 , wherein the second leakage connection ( 52 ) on the low-pressure side is formed by an axial relief channel ( 46 ) which connects the radial relief groove ( 44 ) to the low-pressure space ( 36 ).

12. The pressure-limiting valve according to claim 11 , wherein the axial relief channel ( 46 ) is formed by at least one of a flattened section embodied on the valve piston ( 14 ) and an axial groove ( 47 ) in the valve piston ( 14 ).

Assignees

• Gomola Marek
• Bosch Gmbh Robert

Inventors

• Gomola Marek

Classifications

• F02M63/0054

  Check valves (F02M59/462, F02M59/464 take precedence) · CPC title

• Y10T137/7849

  Bypass in valve casing · CPC title

• F16K15/063

  the valve being loaded by a spring · CPC title

• F02M63/005

  Pressure relief valves · CPC title

• F16K17/048 Primary

  combined with other safety valves, or with pressure control devices · CPC title