FR3064690A1 - RAMP ASSEMBLY AND HIGH PRESSURE VALVE - Google Patents

Abstract

Ramp assembly and high pressure valve (12), RHPV assembly (12), the RHPV assembly (12) comprises: - a ramp (18) pierced so as to define a wall (30) peripheral to a longitudinal channel (31) the 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 - the electromagnet (46) comprising a solenoid (76), a core ( 78), a nonmagnetic ring (80), a cap (82) and a carcass (84) and; the valve seat (42), characterized in that the HPV valve (20) is partially inserted into the housing (32) of the first end of the common rail, the solenoid (76) being arranged in the extension of the wall widened (33) housing.

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.

104 / HIGH PRESSURE RAMP AND VALVE ASSEMBLY.

FR 3 064 690 - A1 (g /) Ramp and high pressure valve assembly (12), RHPV assembly (12) ,, the RHPV assembly (12) includes:

- A ramp (18) pierced so as to define a wall (30) peripheral to a longitudinal channel (31), the 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,

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

-the valve seat (42), characterized in that the HPV valve (20) is partially inserted in the housing (32) of the first end of the common rail, the solenoid (76) being arranged in the extension of the wall enlarged (33) housing.

DP-323642

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 or normally open depending on the position of the spring and can be actuated to open a passage and let out fuel thereby allowing permanent control of the pressure in the circuit. 'injection.

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 is known from the prior art comprising a magnetic body on which a carcass of the electromagnet is stacked, sealing elements against the entry of air of 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 simple concept of common rail assembly and high pressure valve, also called RHPV assembly. The RHPV assembly is suitable for mounting in a diesel injection system of an internal combustion engine. The RHPV assembly 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 widens 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 and,

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

-the valve seat provided in its center with an axial fuel discharge orifice connecting the common rail to a transverse evacuation channel produced in the body.

In addition, the HPV valve is partially inserted in the housing of the first end of the common rail, the solenoid being arranged in the extension of the enlarged wall of the housing. The solenoid includes a first transverse face. The first transverse face of the solenoid is arranged against a transverse face) of the enlarged wall of the ramp. In addition, the magnetic carcass is partially inserted on the outer tubular surface 1 of the enlarged wall until it stops against a shoulder arranged on the external surface of the enlarged wall. The RHPV assembly further comprises a clamping means able to additionally receive a clamping tool. In addition, the HPV valve further includes a closure plug. The closing plug is tightened on the cap and coming into abutment against the carcass so that the closing plug closes the HPV valve in the housing of the common rail.

The HPV valve further comprises a connector arranged outside the housing.

A method of assembling the RHPV assembly produced as 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, 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 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 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;

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 partially until it stops against a shoulder arranged on the enlarged tubular wall of the housing of the common rail;

m) overmolding the connector and the solenoid together;

n) assemble the connector and the overmolded solenoid together on the ring 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 (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 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 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 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 wall 30 of the ramp widens at a first end 22 to form an enlarged wall 33 peripheral to a housing 32. The housing 32 of the ramp is arranged to receive the HPV valve 20. The enlarged wall 33 is of cylindrical shape comprising an internal surface having an internal diameter greater than the internal diameter of an internal surface of the peripheral wall 30 of the ramp. The enlarged wall 33 defines a shoulder 35 close to the first end 22 of the ramp. The shoulder 35 is arranged on an outer surface 37 of the enlarged wall 33.

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 inner surface 58 and an outer guide surface 60.

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 60 for guiding the wall 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 solenoid 76 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 cooperates with 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 ramp to a transverse through outlet channel 74 formed at one end of the body 36 and arranged between the longitudinal bore 54 and the outer guide surface 60. The transverse discharge channel 74 is produced in the body 36.

As described in FIG. 2, the electromagnet 46 includes 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 80 is magnetic. 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 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 magnetic. 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 against the carcass 84. The closure plug 86 is tightened on the cap 82 and closes the HPV valve 20 fixed 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, the connector (48) and the electromagnet (46) together are molded together. The connector 48 comprises 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 32 of the first end 22 of the common rail is of cylindrical shape and extends at the end defining a shoulder 35. The term partially means as it is mentioned in the Larousse dictionary that the HPV valve 20 is only partially inserted into 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.

The solenoid 76 of the HPV valve comprises a first transverse face 77 in abutment against a transverse face 110 of the housing 32, thus the solenoid 76 is arranged outside the housing 32. The solenoid 76 and the carcass 84 are arranged in the extension of the wall housing 33. The term extension means that the solenoid 76 extends the enlarged wall 33 longitudinally. The solenoid 76 is an extension, a continuation of the enlarged wall 33 along the longitudinal axis X. The shoulder 35 of the enlarged wall acts as a stop for 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 housed. The carcass 84 of the electromagnet is tubular in shape and extends longitudinally along the axis longitudinal X. The carcass 84 is a cylinder pierced longitudinally in its center and opening on both sides. The carcass 84 comprises a wall with a cylindrical inner surface, a cylindrical outer surface, a first transverse face 85 and a second transverse face. 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 of the common rail. The first transverse face 85 of the carcass 84 is in abutment against the shoulder 35 of the enlarged wall 33. The magnetic carcass 84 is partially inserted on the tubular outer surface 37 of the wall 33 enlarged until it abuts against the shoulder 35 arranged on the outer surface 37 of the enlarged peripheral wall of the housing. When the carcass 84 is mounted on the enlarged peripheral wall, the internal surface of the carcass 84 has a part of the surface which is in contact with the external surface 37 of the enlarged wall 33 as shown in FIG. 2. The part of the internal surface of the carcass 84 in contact with the external surface 37 represents an area of the circulation of the magnetic field between the carcass 84, the peripheral wall 33 and the body 36.

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 non-magnetic 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 partially until it abuts against a shoulder 35 arranged on the enlarged tubular wall 33 of the housing 32 of the common rail;

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 energized, it generates a magnetic field which passes successively through the body 36, the magnetic core 78, the cap 82, the closure plug 86, the carcass 86, the enlarged wall 33 then again in the HPV valve body 36.

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 ίο housing extended wall of the mechanical part shoulder of the external surface of the ramp wall valve body HPV external surface of the enlarged wall spring valve member valve seat electromagnet connector seat face head face longitudinal drilling of the body cylindrical wall of the body interior surface of the body exterior surface of the guide of the medium body clamping head flat valve member pointed end of valve member discharge port solenoid discharge channel core non-magnetic ring carcass cap first transverse face of the carcass closure plug core chamber connector wall

106 HPV valve ball

108 valve seat filter

110 transverse face of the enlarged wall

Claims (10)

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 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, - 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) and; the valve seat (42) provided at its center with an axial orifice (72) for discharging fuel connecting the common rail (18) to a transverse discharge channel (74) produced in the body (36), characterized in that the HPV valve (20) is partially inserted in the housing (32) of the first end of the common rail, the solenoid (76) being arranged in the extension of the enlarged wall (33) of the housing. 2. RHPV assembly (12) according to the preceding claim, wherein the solenoid (76) comprises a first transverse face (77), the first transverse face (77) being arranged against a transverse face (110) of the enlarged wall (33 ) from the ramp. 3. RHPV assembly (12) according to any one of claims 1 to 2, in which the magnetic carcass (84) is partially inserted on the tubular outer surface (37) of the enlarged wall (33) until it stops against a shoulder ( 35) arranged on the outer surface (37) of the enlarged wall. 4. RHPV assembly (12) according to any one of claims 1 to 3, wherein the RHPV assembly (12) further comprises a clamping means (62) adapted to receive a clamping tool additionally. 5. RHPV assembly (12) according to any one of claims 1 to 4, in which the HPV valve (20) further comprises a closing plug (86), the closing plug (86) being tightened on the cap ( 82) and coming into abutment against the carcass (84) so that the closure plug (86) closes the HPV valve (20) in the housing (32) of the ramp. 6. RHPV assembly (12) according to any one of claims 1 to 5, wherein the HPV valve (20) comprises a connector (48) arranged outside the housing (32). 7. Method of assembling an RHPV assembly (12) produced according to any one of claims 1 to 6, 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 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); 5 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; k) mount and tighten the body (36) in the housing (32), for example with 10 a screwing tool arranged additionally in the clamping means (62); l) partially insert the magnetic carcass (84) against a shoulder (35) arranged on the enlarged tubular wall (33) of the housing (32) of the common rail; m) overmolding the connector (48) and the solenoid (76) together; 15 n) 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 ) so that the HPV valve (20) is mounted without the closure plug (86) in the housing (32) of the ramp; o) assemble the closing plug (86) on the HPV valve (20) and screw 20 additionally the closing plug (86) on the cap (82) in order to maintain the solenoid (76) and to guarantee a sealing of the solenoid (76) and of the HPV valve (20). 1/2 O CM CD CD