FR3064691A1 - COMMON RAIL ASSEMBLY AND HIGH PRESSURE VALVE - Google Patents

Abstract

Ramp assembly and high pressure valve (12) comprises: - a common rail (18) and pierced so as to define a peripheral wall (30) to a longitudinal channel (31), said wall (30) widening to a first end (22) for forming an enlarged wall (33) peripheral to a housing (32) adapted to receive a high-pressure valve (20), HPV valve (20), and; the HPV valve (20), comprising; a body (36) provided with a bore (54), a valve member (40) slidably arranged in the bore (54), an electromagnet (46) comprising a solenoid (76), a magnetic core (78), ), a nonmagnetic ring (80), a magnetic cap (82) and a carcass (84) and; -a valve seat (42) and, characterized in that the HPV valve (20) is fully inserted into the housing (32), said enlarged wall (33) defining the magnetic housing (84) of the electromagnet.

Description

Holder (s): DELPHI INTERNATIONAL OPERATIONS LUXEMBOURG S.A R.L. Limited liability company.

Extension request (s)

Agent (s): DELPHI FRANCE SAS Simplified joint-stock company.

(04) JOINT RAMP AND HIGH PRESSURE VALVE ASSEMBLY.

FR 3 064 691 - A1 fü /) Ramp and high pressure valve assembly (12) includes:

- A common ramp (18) and pierced so as to define a peripheral wall (30) to a longitudinal channel (31), said wall (30) widening at a first end (22) to form an enlarged wall (33 ) peripheral to a housing (32) capable of receiving a high pressure valve (20), HPV valve (20), and;

- the HPV valve (20), comprising;

- a body (36) provided with a bore (54),

- a valve member (40) slidingly arranged in the bore (54),

- an electromagnet (46) comprising a solenoid (76), a magnetic core (78), a non-magnetic ring (80), a magnetic cap (82) and a carcass (84) and;

-a valve seat (42) and, characterized in that the HPV valve (20) is fully inserted in the housing (32), said enlarged wall (33) defining the magnetic carcass (84) of the electromagnet.

DP-323641

Common rail and high pressure valve assembly

TECHNICAL AREA

The invention relates to a common rail and a high pressure valve for a diesel injection circuit and more particularly the arrangement of these components and the manufacture thereof.

TECHNOLOGICAL BACKGROUND OF THE INVENTION

The direct fuel injection circuits in internal combustion engines include a pilot-operated valve which can be directly engaged on a common rail distributing the pressurized fuel to injectors. The control valve also called high pressure valve or HPV valve (acronym for "high pressure valve") is normally closed or normally open depending on the position of the spring and can be actuated to open a passage and let out fuel allowing continuously monitor the pressure in the injection circuit.

Among other things, high pressure valves are known comprising a tubular body in which a valve member, also called a needle, controlled by an electromagnetic actuator blocks or frees the fuel outlet passage.

In normal operation, the passage is closed and its closure is ensured by the piloted actuator which exerts on the needle a closing force opposing the opening force exerted on the needle by the pressurized fuel. There is known from the prior art a valve comprising a magnetic body on which the carcass of the electromagnet is stacked to close the magnetic flux, sealing elements against the entry of air, fluid or particles and a solenoid. . The assembly of the high pressure valve and its assembly on the common rail are complex and their costs high.

It has become urgent to offer high pressure valves that are easy and less expensive to manufacture and perfectly sealed. The object of the present invention is to provide a solution which overcomes these drawbacks.

SUMMARY OF THE INVENTION

The present invention proposes to solve these problems by a new simple concept of a ramp and high pressure valve assembly, also called RHPV assembly. The RHPV assembly is suitable for mounting in a diesel injection system of an internal combustion engine. The RHPV set extends along a longitudinal axis and includes:

- a common ramp elongated along the longitudinal axis and pierced so as to define a peripheral wall to a longitudinal channel. Said wall widens at a first end to form an enlarged wall peripheral to a housing capable of receiving a high pressure valve also called an HPV valve and;

- the HPV valve comprising;

- a body extending along the longitudinal axis provided with a hole,

- a valve member arranged sliding in the bore of the HPV valve body and cooperating with an electromagnet and a valve seat,

- the electromagnet comprising a solenoid, a magnetic core, a non-magnetic ring, a magnetic cap and a carcass and;

-the valve seat provided in its center with an axial fuel discharge orifice connecting the common rail to an evacuation channel formed at a pointed end of the valve member extending axially.

In addition, the HPV valve is fully inserted into the housing of the first end of the common rail and said enlarged wall defines the magnetic casing of the electromagnet. The RHPV assembly also includes a closure plug arranged at the end of the ramp. The closure cap is fixed on the cap and in contact with a transverse face of the enlarged wall of the ramp. The closing plug closes the housing and ensures the looping of the magnetic circuit. The body comprises a clamping means able to receive a complementary clamping tool so that the clamping tool clamps the body in the housing. In an alternative to the embodiment, the body comprises a screwing means capable of receiving a complementary screwing tool so that the screwing tool comes to screw the body into the housing. A method of assembling an RHPV assembly described above comprises the following steps:

a) provide the common rail;

b) provide the body, a ball, a spring, the valve member, the valve seat, a valve seat filter, the solenoid, the core, the non-magnetic ring, the cap, the carcass, a closure cap and a connector. The assembly method of the RHPV assembly further includes the following steps:

k) mounting and tightening the body in the housing, for example with a screwing tool arranged additionally in the clamping means;

m) assemble the connector and the solenoid molded together on the ring and the cap welded together, the connector and the solenoid being inserted in the housing of the manifold so that the HPV valve is mounted without the closure plug in the housing of the ramp ;

n) assemble the closing plug on the HPV valve and screw on the cap additionally.

BRIEF DESCRIPTION OF THE DRAWINGS

Other characteristics, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the appended drawings given by way of non-limiting example and in which:

Figure 1 is a general perspective view of a common rail and high pressure valve assembly.

Figure 2 is a sectional view of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

To facilitate and clarify the following description, the orientation from top to bottom is chosen arbitrarily and, words and expressions such as above, below, above, below, top, bottom ... can be used without any intention of limit the invention.

According to FIG. 1, a common rail system 10 of a pressurized fuel injection device of an internal combustion engine is described.

According to FIG. 1, the common rail system 10 comprises a common rail and high pressure valve assembly 12, a high pressure sensor 14 and injectors 16. The common rail and high pressure valve assembly 12 also called RHPV assembly 12 (acronym for the English name “Rail and High Pressure Valve”) comprises a common rail 18 (also commonly called a rail) and a high pressure valve 20 also called a HPV valve 20 (acronym for the English name “high pressure valve”). The terms RHPV assembly and HPV valve will be used in the following description. The RHPV 12 assembly extends along a longitudinal axis X.

According to Figures 1 and 2, the common rail 18 comprises a first end 22 provided with a first opening cooperating with the high pressure valve 20 and a second end 26 provided with a second opening cooperating with the high pressure sensor 14. The rail joint 18 is elongated and tubular. The common rail 18 extends along the longitudinal axis X. The common rail 18 is pierced so as to define a wall 30 peripheral to a longitudinal channel 31. The wall 30 of the rail defines a cylindrical volume intended to contain fuel under high pressure and to supply the injectors 16. The wall 30 of the ramp widens at the first end 22 to form an enlarged wall 33 peripheral to a housing 32. The housing 32 is arranged to receive the HPV valve 20. The The enlarged wall 33 is cylindrical in shape and extends longitudinally along the axis X. The enlarged wall 33 comprises a cylindrical internal surface with an internal diameter greater than the internal diameter defining the wall 30 of the common rail.

As shown in Figure 2, the embodiment of the invention describes a sectional view of the HPV valve 20 which extends along the longitudinal axis X and which is inserted into the housing 32 of the common rail. The HPV valve 20 comprises a mechanical part 34 comprising a body 36, a spring 38, a valve member 40 and a valve seat 42 and an electromagnetic part 44 comprising an electromagnet 46 and a connector 48.

As described in FIG. 2, the body 36 is cylindrical in shape and extends longitudinally along the axis X between a seat face 50 and a head face 52. The body 36 is provided with a longitudinal bore 54 defining a wall 56 having an inner surface 58 and an outer guide surface 60. The body 36 also comprises at least one clamping means 62, for example a screwing means 62, arranged in the wall 56 transversely to the longitudinal axis X. The screwing means 62 is capable of receiving a clamping tool (not shown ) suitable for fixing the body 36 in the housing 32 of the common rail. The tightening tool can for example be a screwing tool. In an alternative to the clamping means, the body 36 comprises a grooved cylindrical part (not shown) arranged in the external surface 60 for guiding the wall. The grooved part is capable of receiving the tightening tool in addition to fix the body 36 in the housing 32.

The valve member 40 is arranged to slide in the longitudinal bore 54 of the body. The valve member 40 cooperates with the electromagnet 46 and the valve seat 42. The valve member 40 is of elongated shape extending between a flat head 68 and a pointed end 70. The pointed end 70 of the valve member cooperates with the valve seat 42 to open or close a fuel discharge port 72. The valve seat 42 is provided in the center of the axial fuel discharge port 72 connecting the longitudinal channel 31 to a transverse outlet channel 74 formed at one end of the body 36 and arranged between the longitudinal bore 54 and the surface outer guide 60.

As described in FIG. 2, the electromagnet 46 comprises a solenoid 76, a core 78, a non-magnetic ring 80, a cap 82, a carcass 84 defined in the enlarged wall 33 and a closure plug 86. The core 78 has a cylindrical shape provided with a wall defining a longitudinal recess with an opening. The core 78 extends longitudinally along the longitudinal axis X. The core 78 is arranged in a chamber of the core 94 defined by the body 36, the non-magnetic ring 80 and the cap 82. The non-magnetic ring 80 is arranged on the outer surface 60 for guiding the wall of the body close to the head face 52. The cap 82 is arranged in addition to the core 78. The cap 82 is mounted on the core 78 on the side of the opening of the recess. The closure plug 86 has a nut function. The closure plug 86 comprises a head and a longitudinal skirt. The closure plug 86 is arranged in addition to the cap 82 and bears on the housing 32. The closure plug 86 is tightened on the cap 82 and abuts on the housing 32. The closure plug 86 closes the HPV valve 20 in housing 32 of the common rail. The closure plug 86 completes the magnetic circuit of the HPV valley 20 by coming into abutment against the enlarged wall 33 of the ramp. The closure plug 86 is screwed onto the cap 82. The connector 48 is a molded assembly comprising a peripheral wall forming a connector body at the center of which are metal plugs electrically connected to the terminals of the solenoid 76. The carcass 84 of the electromagnet is defined at the end of the enlarged wall 33 of the common rail. The enlarged wall 33 has a wall thickness in the zone defining the carcass 84 less than the thickness of the peripheral wall 30 and less than the thickness of the enlarged wall 33 in contact with the body 36 of the HPV valve. The carcass 84 of the electromagnet is an extension of the wall 30 of the housing of the common rail, the carcass 84 being arranged in the housing 32 on the side opposite to the longitudinal channel 31. The carcass 84 of the electromagnet is defined at the end of the housing 32 of the first end 22 of the common rail. One of the advantages of this invention is that the carcass 84 is produced in the enlarged wall 33 of the ramp making it possible to complete the magnetic circuit. According to FIG. 2, the carcass 84 is cylindrical with a wall cooperating with the solenoid 76. The solenoid 76 is arranged inside the carcass 84.

The HPV valve 20 is fully inserted into the housing 32 of the first end 22 of the common rail. The HPV valve 20 is screwed into the housing 32 of the ramp. The housing 32 of the first end of the common rail is cylindrical in shape and extends at the end defining the carcass 84 of the electromagnet. The closure plug 86 is arranged at the end of the common rail 18 and closes the housing 32 in which the HPV valve 20 is entirely housed. The closure plug 86 is fixed on the cap 82 and in abutment on a transverse face of the housing 32.

The method of assembling the HPV valve 20 in the common rail 18 is part of the method of assembling the RHPV12 assembly. The steps in the process of assembling the HPV 20 valve in the common rail include the following steps:

a) provide the common rail 18;

b) provide the body 36, a ball 106, a spring 38, the valve member 40, the valve seat 42, a valve seat filter 108, the solenoid 76, the core 78, the non-magnetic ring 80, the cap 82, the carcass 84, the closure plug 86 and a connector 48;

c) weld the non-magnetic ring 80 and the cap 82 together then mount the core 78 in the ring 80 and the cap 82 welded together;

d) mounting the spring 38 in the body 36;

e) assemble the non-magnetic ring 80, the cap 82 and the core 78 on the body 36 by inserting the ring 80 and cap 82 welded together in the end of the HPV valve body 36 on the side of the head face 52 of the body;

f) soldering the non-magnetic ring 80 in the body 36;

g) mounting the valve member 40 in the bore 54 of the body 36;

h) mount the ball 106 in the valve seat 42;

i) tightly mount the valve seat filter 108 on the valve seat 42 then crimp the filter 108 on the valve seat 42;

j) tightly mount the valve seat 42 in the seat face 50 of the body 36 of the HPV valve 20;

k) mounting and tightening the body 36 in the housing 32, for example with a screwing tool arranged additionally in the clamping means 62;

l) overmolding the connector 48 and the solenoid 76 together;

m) assemble the connector 48 and the solenoid 76 overmolded together on the ring 80 and the cap 82 welded together, the connector 48 and the solenoid 76 being inserted in the housing 32 so that the HPV valve 20 is mounted without the closure cap 86 in the housing 32 of the ramp;

n) assemble the closing plug 86 on the HPV valve 20 and screw in addition on the cap 82 in order to maintain the solenoid 76 and to guarantee a tightness of the solenoid 76 and of the HPV valve 20.

In operation, the pressurized fuel circulates in the common rail 18. Below a preset oil pressure, the electromagnet 46 is supplied and the pointed end 70 of the valve member 40 is in contact with the valve seat 42 which closes the discharge port 72. When the fuel pressure in the common rail 18 exceeds the preset limit, the pressurized fuel can then be evacuated by passing successively from the common rail 18 to the discharge port 72 then in the evacuation channel 74.

In operation, when the electromagnet is supplied, it generates a magnetic field which passes successively through the body 36, the magnetic core 78, the cap 82, the closure plug 86 and the carcass 86 provided in the common rail 18 then again in valve body 36

HPV.

LIST OF REFERENCES USED common rail system common rail and high pressure valve assembly 14 high pressure sensor injector common rail high pressure valve first end of the rail second end of the rail peripheral wall of the rail longitudinal channel housing enlarged peripheral wall mechanical part body HPV valve spring valve member valve seat electromagnetic part electromagnet connector seat face head face longitudinal bore of the body cylindrical wall of the body internal surface external surface of guide tightening means flat head of valve member pointed end discharge orifice channel solenoid discharge core non-magnetic ring carcass cap closure plug core chamber HPV valve ball valve seat filter transverse face of the enlarged peripheral wall ίο

Claims (5)

1 Ramp and high pressure valve assembly (12), RHPV assembly (12), adapted to be mounted in a diesel injection system of an internal combustion engine, the RHPV assembly (12) extending along a longitudinal axis (X) and comprising: - A common rail (18) elongated according to longitudinal tax (X) and drilled so as to define a peripheral wall (30) to a longitudinal channel (31), said wall (30) widening at a first end (22) to form an enlarged wall (33) peripheral to a housing (32) capable of receiving a high pressure valve (20), HPV valve (20), and; - the HPV valve (20), comprising; - a body (36) extending along the longitudinal axis (X) provided with a bore (54), a valve member (40) arranged sliding in the bore (54) and cooperating with an electromagnet (46) and a valve seat (42) and, - T electromagnet (46) comprising a solenoid (76), a magnetic core (78), a non-magnetic ring (80), a magnetic cap (82) and a carcass (84) and; the valve seat (42) provided in its center with an axial orifice (72) for discharging fuel connecting the common rail (18) to an evacuation channel (74) formed at a pointed end (70) of the member axially extending valve, characterized in that the HPV valve (20) is fully inserted in the housing (32) of the first end of the common rail, said enlarged wall (33) defining the magnetic carcass (84) of T electro magnet. 2. RHPV assembly (12) according to the preceding claim, further comprises a closure plug (86) arranged at the end of the ramp (18), the closure plug (86) being fixed on the cap (82) and in contact with a transverse face (110) of the enlarged wall (33), the closure plug (86) closing the housing (32) and ensuring the looping of the magnetic circuit. 3. RHPV assembly (12) according to any one of claims 1 or 2, wherein the body (36) comprises a clamping means (62) adapted to receive a complementary clamping tool so that the clamping tool comes tighten the body (36) in the housing (32). 4. RHPV assembly (12) according to claim 3, wherein the body (36) comprises a screwing means (62) adapted to receive a complementary screwing tool so that the screwing tool comes to screw the body (36) in the housing (32). 5. Method of assembling an RHPV assembly (12) produced according to any one of claims 1 to 4, comprising the following steps: a) provide the common rail (18); b) providing the body (36), a ball (106), a spring (38), the valve member (40), the valve seat (42), a valve seat filter (108), the solenoid (76), the core (78), the non-magnetic ring (80), the cap (82), the carcass (84), a closure plug (86) and a connector (48), characterized in that the method d assembly also includes the following steps: K) mounting and tightening the body (36) in the housing (32), for example with a screwing tool arranged additionally in the clamping means (62); m) assemble the connector (48) and the solenoid (76) molded together on the ring (80) and the cap (82) welded together, the connector (48) and the solenoid (76) being inserted in the housing (32) from the ramp so the 25 HPV valve (20) is mounted without the closure plug (86) in the housing (32) of the ramp; n) assemble the closing plug (86) on the HPV valve (20) and screw additionally on the cap (82). 1/2 ο CM CD