FR3064688A1 - RAMP ASSEMBLY AND HIGH PRESSURE VALVE - Google Patents

Abstract

Ramp assembly and high pressure valve (12), RHPV assembly (12), comprises: - a common rail (18) pierced so as to define a wall (30) peripheral 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) and; an HPV valve (20) comprising; a body (36) provided with a bore (54), a valve member (40) slidably arranged in the bore (54) and an electromagnet (46) comprising a solenoid (76), a core (78), ), a nonmagnetic ring (80), a cap (82) and a carcass (84) provided with a transverse folded portion (85) and; a valve seat (42) and; a closure cap (86); characterized in that the transverse folded portion (85) of the carcass (84) is supported on a transverse face (110) of the widened wall (33) of the ramp (18).

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) HIGH PRESSURE RAMP AND VALVE ASSEMBLY.

FR 3 064 688 - A1 _ Ramp and high pressure valve assembly (12), RHPV assembly (12), includes:

- A common rail (18) pierced so as to define a wall (30) peripheral 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) and;

- an HPV valve (20) comprising;

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

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

- an electromagnet (46) comprising a solenoid (76), a core (78), a non-magnetic ring (80), a cap (82) and a carcass (84) provided with a transverse folded portion (85) and;

a valve seat (42) and;

a closure plug (86);

characterized in that the transverse folded portion (85) of the carcass (84) is supported on a transverse face (110) of the enlarged wall (33) of the ramp (18).

DP-323644

Ramp 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, is normally closed and can be actuated to open a passage and let out fuel, thus allowing the pressure in the injection circuit to be constantly monitored.

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. A valve comprising a magnetic body on which the coil housing of the electromagnet is stacked, a seal and the coil itself is known from the prior art. 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 simple concept of common rail and high pressure valve assembly. The ramp and high pressure valve assembly, RHPV assembly, is suitable for mounting in a diesel injection system of an internal combustion engine. All

RHPV extends along a longitudinal axis (X) 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 widening at a first end to form an enlarged wall peripheral to a housing capable of receiving a high pressure valve , 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 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 magnetic carcass provided with a transverse folded portion and;

the valve seat provided in its center with an axial fuel discharge orifice connecting the common rail to an evacuation channel produced in the body and;

-a closure cap.

In addition, the transverse folded portion of the carcass is supported on an annular transverse face of the enlarged wall of the ramp.

In addition, the electromagnet of the HPV valve is supplied and generates a magnetic field which passes successively through the magnetic body, the magnetic core, the magnetic cap, the magnetic closure plug, the magnetic casing and into the enlarged magnetic wall of the ramp. common then back into the magnetic HPV valve body.

In addition, the body is provided with a clamping means, said clamping means being adapted to receive an additional clamping tool adapted to clamp the body of the HPV valve in the housing of the ramp. In an alternative to the embodiment, the clamping means is a screwing means. The clamping means is adapted to receive an additional screwing tool adapted to screw the body of the HPV valve into the housing of the ramp. In addition, an assembly method for the HPV 20 valve in the common rail is part of the assembly process for the RHPV assembly. The steps in the process of assembling the HPV valve in the common rail include 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, the closure plug and a connector;

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

d) mount the spring in the body;

e) assemble the non-magnetic ring, the cap and the core on the body by inserting the ring and the cap welded together in the end of the HPV valve body on the side of the head face of the body, the non-magnetic ring screwing onto the body;

f) weld the non-magnetic ring in the body of the HPV valve;

g) mount the valve member in the bore of the body;

h) mount the ball in the valve seat;

i) tighten the valve seat filter on the valve seat and then crimp the filter on the valve seat;

j) tighten the valve seat in the seat face of the HPV valve body;

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

l) insert the magnetic carcass on the body, the carcass abutting against the transverse face of the enlarged wall of the ramp;

m) overmolding the connector and the solenoid together;

n) assemble the connector and the overmolded solenoid together on the ring 80 and the cap welded together, the connector and the solenoid being inserted in the housing so that the HPV valve is mounted without the closure plug in the housing of the ramp;

o) assemble the closing plug on the HPV valve and screw the closing plug additionally on the cap in order to maintain the solenoid and guarantee a tightness of the solenoid and the HPV valve.

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 of a pressurized fuel injection device of an internal combustion engine is described.

According to FIG. 1, a common rail system 10 includes 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 and a high pressure valve 20 also called HPV valve 20 (acronym of 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 let 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 common rail 18 is elongated and tubular. The common rail 18 extends along the longitudinal axis X. The common rail 18 is drilled so as to define a peripheral wall 30 to a longitudinal channel 31. The peripheral wall 30 of the ramp defines a cylindrical volume intended to contain fuel under high pressure and to supply the injectors 16. The peripheral wall 30 of the ramp widens at the first end 22 to form a housing 32 arranged to receive the HPV valve 20. The peripheral wall 30 widens at a first end 22 to form an enlarged peripheral wall 33 with a housing 32. The housing 32 of the ramp is arranged to receive the HPV valve 20. The enlarged peripheral wall 33 is of cylindrical shape comprising an internal surface having an internal diameter greater than the internal diameter an inner surface of the peripheral wall 30 of the ramp.

As shown in FIG. 2, the embodiment of the invention describes a sectional view of the HPV valve 20 extending along the longitudinal axis X and partially inserted into the ramp 18. The term partially means as it is mentioned in the Larousse dictionary that the valve is only partially inserted in the ramp. 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 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 interior surface 58 and an exterior surface. The body 36 comprises at least one clamping means 62, for example which can be a screwing means 62. The clamping means 62 is arranged in the wall 56 transversely to the longitudinal axis X. The clamping means 62 is suitable for receiving a clamping tool (not shown) adapted to fix the body 36 in the housing 32 of the common rail. The tightening tool can for example be a screwing tool. The screwing tool is not shown. The screwing tool is adapted to be inserted into the screwing means 62 in order to screw or unscrew the body 36 of the HPV valve. In an alternative to the clamping means 62 which is not shown, the body 36 may comprise a grooved cylindrical part arranged on the external surface of the cylindrical wall 56 of the HPV valve body. The grooved part (not shown) is capable of receiving additionally a tightening tool (not shown) for fixing 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 elongate and cylindrical shape extending between a flat head 68 and a pointed end 70. The pointed end 70 of the member valve valve 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 of the rail to a transverse through outlet channel 74 formed at one end of the body 36 of the HPV valve. The evacuation channel 74 is produced in the body 36 of the HPV valve.

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 and a closure plug 86.

The core 78 has a cylindrical shape provided with a wall defining a longitudinal recess with an opening arranged opposite the head face 52 of the body. 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 external surface of 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 magnetic ring 80 and the cap 82 are integrally fixed, for example by welding.

The carcass 84 of the electromagnet is tubular in shape and extends longitudinally along the longitudinal axis X. The carcass 84 is a cylinder pierced longitudinally in its center and opening out on both sides. The carcass 84 comprises a transverse connected portion 85 and a cylindrical portion. The electromagnet frame 84 is magnetic. The carcass 84 of the electromagnet is arranged at the end of the housing 32 of the first end 22. The carcass 84 is mounted on the solenoid 76.

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 carcass 84 so that the transverse folded portion 85 of the carcass is pressing against an annular transverse face 110 of the enlarged wall 33. The closing plug 86 closes the HPV valve 20 in the housing 32 of the common rail. In the example of FIG. 2, the closure plug 86 is screwed onto the cap 82 of the electromagnet. The connector 48 is an overmolded assembly comprising a peripheral wall forming a connector body in the center of which are metal plugs electrically connected to the terminals of the solenoid 76.

As shown in Figure 2, the HPV valve 20 is partially inserted into the housing 32 of the first end of the common rail. The housing of the first end 22 of the common rail is of cylindrical shape. The term partially is used to indicate that the solenoid 76 and the carcass 84 are arranged outside the housing 32. The electromagnet 46 is arranged in the extension of the enlarged peripheral wall 33 of the housing. The term extension means that the solenoid 76 extends the enlarged peripheral wall longitudinally. The solenoid 76 and the carcass 84 are an extension, a continuation of the enlarged peripheral wall 33 along the longitudinal axis X. The closure plug 86 is arranged at the end in abutment against the carcass 84 and closes the fixed HPV valve 20 in 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, the non-magnetic ring 80 screwed onto the body 36;

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) insert the magnetic carcass 84 on the body 36, the carcass 84 abutting against the transverse face 110 of the enlarged wall 33 of the ramp;

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

n) 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;

o) assemble the closing plug 86 on the HPV valve 20 and screw the closing plug 86 on the cap 82 in addition to maintain the solenoid 76 and guarantee sealing 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 orifice 72. When the fuel pressure in the common rail 18 exceeds the preset limit, the electromagnet is no longer supplied (not shown in the figures) and the pressurized fuel can then be evacuated by passing successively from the common rail 18 to the discharge orifice 72 then into the evacuation channel 74.

In operation, when the electromagnet 46 is powered, it generates a magnetic field which passes successively through the magnetic body 36, the magnetic core 78, the magnetic cap 82, the magnetic closure plug 86, the magnetic carcass 86 and the enlarged wall. 33 magnetic ramp.

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

Claims (7)

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 along the longitudinal axis (X) and drilled so as to define a wall (30) peripheral 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 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), - the electromagnet (46) comprising a solenoid (76), a magnetic core (78), a non-magnetic ring (80), a magnetic cap (82) and a magnetic carcass (84) provided with a transverse folded portion (85 ) and; the valve seat (42) provided at its center with an axial orifice (72) for discharging fuel connecting the common rail (18) to an evacuation channel (74) produced in the body (36) and; a closure plug (86); characterized in that the transverse folded portion (85) of the carcass (84) is supported on an annular transverse face (110) of the enlarged wall (33) of the ramp (18). 2. RHPV assembly (12) according to the preceding claim, in which the electromagnet (46) of the HPV valve (20) is supplied and generates a magnetic field which passes successively through the magnetic body (36), the core (78). magnetic, the magnetic cap (82), the magnetic closure cap (86), the magnetic casing (84) and in the enlarged magnetic wall (33) of the common rail then again in the magnetic valve body (36) HPV. 3. RHPV assembly (12) according to any one of claims 2 there, wherein the body (36) is provided with a clamping means (62), said clamping means (62) being adapted to receive a tool. additional tightening suitable for tightening the body (36) of the HPV valve in the housing (32) of the ramp. 4. RHPV assembly (12) according to claim 3, wherein the clamping means (62) is a screwing means (62), said clamping means (62) being adapted to receive a complementary screwing tool adapted to screw the body (36) of the HPV valve in the housing (32) of the ramp. 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), 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 the cap (82) welded together in the end of the body (36 ) HPV valve on the side of the head face (52) of the body, the non-magnetic ring (80) screwing onto the body (36); f) welding 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) tighten the valve seat filter (108) on the valve seat (42) then crimp the filter (108) on the valve seat (42); j) tighten 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); 5 1) insert the magnetic carcass (84) on the body 36 of the HPV valve, the carcass (84) abutting against the transverse face (110) of the enlarged wall (33); m) overmolding the connector (48) and the solenoid (76) together; n) assemble the connector (48) and the solenoid (76) molded together 10 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 plug closure (86) in the housing (32) of the ramp; o) assemble the closing plug (86) on the HPV valve (20) and screw the closing plug (86) additionally on the cap (82) in order to 15 maintain the solenoid (76) and guarantee sealing of the solenoid (76) and of the HPV valve (20). 1/2 Ο CM