Pressure regulator for a high-pressure rail of a fuel injection system

Patent metadata

Field	Value
Publication number	US-10151284-B2
Application number	US-201515538834-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Dec 23, 2014
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

The invention relates to a pressure regulator for a high-pressure ramp of a system for injecting fuel into an internal combustion engine, comprising a solenoid valve element (10) which receives an electromagnet (40). The electromagnet controls a needle (20) that closes a valve seat (30) which is connected to a high-pressure inlet and opens into a discharge chamber (13), said discharge chamber communicating with a liquid recirculation system (5) by means of outlet openings (14). The rear face (12) of the solenoid valve element (10) receives a coil (40) which controls the opening process of an armature (41) that is rigidly connected to the needle (20) and is subject to a closing return spring (25). The discharge chamber (13) is located on the front face (11) of the solenoid valve element (10) on the axis (XX) of the needle (20), and the discharge chamber surrounds the needle. A cavity (15) passes through the discharge chamber, said cavity receiving an inlet valve element (50), and a bore (51) which opens into the valve seat (30) passes axially through the inlet valve element. The discharge chamber (13) through which the needle (20) passes axially and the outlet openings (14) which are connected to the liquid recirculation system open transversally into a wall (131) in the discharge chamber (13) below the upper part (132) of the chamber. The regulator is characterized that the regulator comprises an annular expansion (70) of the discharge chamber (13) below the outlet openings (14) along the extension of a conical surface (31), which forms the valve seat (30) and an annular dead volume (70), above the surface (54) of the valve element (50), which forms the base of the discharge chamber (13) and has the valve seat (30) in the center of the valve element.

First claim

The invention claimed is:

1. A pressure regulator for a high-pressure rail of a system for injecting fuel into an internal combustion engine, comprising a solenoid valve body ( 10 ), which accommodates a solenoid ( 40 ), wherein the solenoid controls a needle ( 20 ) that closes a valve seat ( 30 ), wherein the valve seat is connected to a high-pressure inlet and opens into a discharge chamber ( 13 ), wherein the discharge chamber includes outlet apertures ( 14 ) configured to communicate with a liquid return circuit,
wherein a rear side ( 12 ) of the solenoid valve body ( 10 ) accommodates a coil, which controls the opening of an armature ( 41 ), wherein the armature is fixedly connected to the needle ( 20 ) and is subject to a closing return spring ( 25 ),
wherein a front side ( 11 ) of the solenoid valve body ( 10 ), in an axis (XX) of the needle ( 20 ), comprises the discharge chamber ( 13 ), which surrounds the needle ( 20 ) and extends through a cavity ( 15 ) accommodating an inlet valve body ( 50 ), wherein a bore ( 51 ), which opens into the valve seat ( 30 ), passes axially through the valve body,
wherein the discharge chamber ( 13 ), through which the needle ( 20 ) axially passes, and the outlet apertures ( 14 ), which are connected to the liquid return circuit, open transversely into a wall ( 131 ) in the discharge chamber ( 13 ) below an upper part ( 132 ) of the chamber,

wherein above a surface ( 54 ) of the valve body ( 50 ), which forms a base of the discharge chamber ( 13 ) and has the valve seat ( 30 ) at a center of the surface ( 54 ), said regulator comprises an annular enlargement ( 70 ) of the discharge chamber ( 13 ) below the outlet apertures ( 14 ) in an extension of a conical surface ( 31 ) which constitutes the valve seat ( 30 ) and forms an annular dead volume ( 70 ), and wherein the dead volume ( 70 ) has the following dimensional features: a diameter D 1 (D 11 , D 12 ) greater than a diameter D 2 of the discharge chamber, an axial length (L 1 ) smaller than or equal to an axial length of the discharge chamber ( 13 ) between the upper surface ( 54 ) of the valve body ( 50 ) and the apertures ( 14 ), which communicate with the liquid return circuit.

2. The pressure regulator as claimed in claim 1 , characterized in that the valve body ( 50 ) is accommodated in the cavity ( 15 ) at the front side ( 11 ) of the solenoid valve body ( 10 ) with an insertion of an annular shim ( 60 ), an inside diameter (D 2 ) of which forms at least a part of the height of the annular dead volume ( 70 ).

3. The pressure regulator as claimed in claim 1 , characterized in that the valve body ( 50 ) is flanged into the cavity ( 15 ).

4. The pressure regulator as claimed in claim 1 , characterized in that the valve body ( 50 ) is retained in the cavity ( 15 ) by a flange formed by a wall ( 153 ) of the valve body.

5. The pressure regulator as claimed in claim 4 , characterized in that an external contour of the valve body ( 50 ) forms a flange shoulder ( 53 ) engaged by the flange.

Assignees

• Bosch Gmbh Robert
• Michael Best & Friedrich LLP

Inventors

• Bruyere Lionel

Classifications

• F02M63/023

  Means for varying pressure in common rails (pressure control F02D41/3845) · CPC title

• F02M63/0052

  with means for adjusting the opening pressure, e.g. electrically controlled · CPC title

• G05D16/202

  actuated by an electric motor · CPC title

• F02M37/0052 Primary

  Details on the fuel return circuit; Arrangement of pressure regulators · CPC title

• F02M63/025 Primary

  from the common rail · CPC title