Pressure control valve

• US 5,503,184 A
• Filed: 05/11/1994
• Issued: 04/02/1996
• Est. Priority Date: 11/12/1991
• Status: Expired due to Fees

• Current Assignee: ITT Automotive Europe GmbH (Xylem, Inc.)
• Original Assignee: ITT Automotive Europe GmbH (Xylem, Inc.)
• Inventors: Beck, Erhard, Reinartz, Hans-Dieter, Volz, Peter
• Primary Examiner(s): Michalsky, Gerald A.
• Application Number:
  US08/244,001
• Time in Patent Office: 692 Days
• Field of Search: 137/625.3, 137/625.37, 251/118, 251/129.02, 251/129.07, 251/129.08, 303/119.2
• US Class Current: 137/625.3
• CPC Class Codes: B60T 8/3615 Electromagnetic valves specially adapted for anti-lock brake and traction control systems electromagnetic valves in general F16K31/06
• CPC Class Codes: B60T 8/367 Seat valves, e.g. poppet valves
• CPC Class Codes: B60T 8/5025 in hydraulic brake systems
• CPC Class Codes: G05D 16/2022 actuated by a proportional solenoid throttling means G05D16/2024
• CPC Class Codes: Y10T 137/86734 With metering feature
• CPC Class Codes: Y10T 137/86791 Piston

Abstract

A pressure control valve with a valve-closing member which is axially movably guided within a valve housing and which is capable of adjusting a passage between a first pressure agent connection and at least one second pressure agent connection depending on its position being variable in respect of a valve seat, pressure agent transition ducts to be shut off or opened up directly one after the other by the valve-closing member being positioned between the first and the second pressure agent connections for the reduction of the noise of the valve, which said pressure agent transition ducts form a variable cross-sectional area of the valve opening.

Claims

1. A pressure control valve having a valve-closing member which is capable of adjusting a passage between a first pressure agent connection and at least one second pressure agent connection depending on its position, comprising:

a first pressure chamber and a second pressure chamber which are isolated from each other by sealing elements and are arranged directly one after the other between the first and the second pressure agent connections,

a valve tappet extending through the sealing elements and a guide element, said sealing elements being arranged sealedly and radially movably on said guide element, the guide element having a bore for slidably receiving said valve tappet such that said tappet can move axially relative to said guide element,

two pressure agent transition ducts provided in one of said first or second pressure chamber to form a variable cross-sectional area of a valve opening between said first and second pressure agent connections,

a valve-supporting element arranged in series relative to a valve seat, said valve-closing member abutting a portion of one of said valve-supporting element or said valve seat at one end of an axial travel of said valve tappet and wherein said transition ducts are provided in one of said valve-supporting element or said valve seat, arranged in a cascaded axial arrangement such that axial movement of said valve-closing member sequentially opens or closes, depending on the direction of axial movement, said transition ducts to thereby allow pressure agent to be communicated between the first pressure agent connection and the second pressure agent connection.

2. A pressure control valve as claimed in claim 1, wherein said plurality of pressure agent transition ducts are defined through a portion of said valve-supporting element.

3. A pressure control valve as claimed in claim 1, wherein the pressure control valve is an electromagnetically controllable proportional valve including an electromagnetic armature that variably adjusts a stroke of the valve-closing member axial travel by a variation of a current within a coil in said electromagnetic armature.

4. A pressure control valve as claimed in claim 3, wherein said proportional valve is hydraulically pressure-balanced, and wherein a spring is arranged as a force counteracting the force of said electromagnetic armature.

5. A pressure control valve as claimed in claim 1, wherein said pressure agent transition ducts are distributed over a plurality of valve stroke sections and are directed toward the valve-closing member substantially at a right angle to the direction of said axial travel of said valve tappet.

6. A pressure control valve as claimed in claim 1, wherein said plurality of pressure agent transition ducts are defined through a portion of said valve seat.

7. A pressure control valve having a valve-closing member which is capable of adjusting a passage between a first pressure agent connection and at least one second pressure agent connection depending on its position, comprising:

a first pressure chamber and a second pressure chamber which are isolated from each other by sealing elements,

a valve tappet extending through the sealing elements, said sealing elements being arranged sealedly and radially movably on a guide element, the guide element having a bore for slidably receiving the valve tappet,

wherein said valve-closing member is furnished with a plunger piston having a generally spherical section that is guided so as to be abuttable against a valve seat, said generally spherical section of said valve-closing member having a larger diameter than said plunger piston, and

a plurality of pressure transition ducts provided in said valve seat and being axially arranged such that axial movement of said plunger piston relative to said valve seat sequentially opens or closes said transition ducts, respectively, and wherein said generally spherical section closes off all of said transition ducts when said spherical section abuts against said valve seat.

8. A pressure control valve as claimed in claim 7, wherein said valve seat further comprises a first valve seat surface which is flared funnel-shaped and a cylindrical second slide valve sealing surface which is penetrated by said plurality of pressure agent transition ducts, which are in sequential axial alignment.

9. A pressure control valve as claimed in claim 7, wherein the pressure agent transition ducts are furnished with at least one of an orifice and a restrictor.