KR20170032200A - Valve for metering a fluid - Google Patents

Abstract

The present invention relates to a valve (1) for metering a fluid which is used specifically as a fuel injector valve for an internal combustion engine. The valve (1) for metering a fluid comprises an electromagnetic actuator (2) and a valve needle (7) which is operated by an armature (4) of the actuator (2). The armature (4) is guided to be moved on the valve needle (7). Also, a spring member (28) is provided. The spring member (28) fixes a position of the armature (4) with respect to the valve needle (7) at least by a spring force transfer means (20, 60) connected to the armature (4) to press a stop member (9, 10) arranged on the valve needle (7). On the one hand, the spring member (28) is clamped on the armature (4) or the spring force transfer means (20, 60) in a radial direction. On the other hand, the spring member (28) is clamped between the stop member (9, 10) in the radial direction. Accordingly, the armature (4) can be rotated and fixed without a gap.

Description

[0001] VALVE FOR METERING A FLUID [0002]

The present invention relates to a valve for fluid metering, particularly to a fuel injection valve for an internal combustion engine. Particularly, the present invention relates to the field of an injector for a fuel injection system of an automobile, in which direct injection of fuel into a combustion chamber of an internal combustion engine is preferably carried out.

DE 103 60 330 A1 discloses a fuel injection valve for use in a fuel injection system of an internal combustion engine. The known fuel injection valve includes a valve needle and an armature connected to the valve needle, the valve needle interacting with the valve seat surface to form a sealing sheet, the armature being urged in the closing direction by a return spring, Interact with the coil. In this case, the armature is fixedly positioned on the valve needle.

An object of the present invention is to improve the design and operation of the valve.

The problem is solved by a valve comprising the features of independent claim 1.

The valve according to the invention, including the features of claim 1, has the advantage that improved design and operating modes are possible. In particular, in an embodiment with free travel of the armature, rotational movement of the armature relative to the valve needle can be prevented. Preferred measures of the valve as set forth in claim 1 are possible by the measures set out in the dependent claims.

In the fluid metering valve, the armature used as a magnetic armature is not fixedly connected to the valve needle but is supported in a cantilever manner between the stoppers. These stoppers may be implemented by stop sleeves and / or stop rings. The at least one spring causes the armature to move from the rest position to the stopper which is positionally fixed with respect to the valve needle, so that the armature comes into contact therewith. During valve control, the complete pre-travel of the armature is provided as an acceleration section.

This achieves the advantage that the valve needle can be reliably opened even at higher pressures by the occurrence of the impact of the armature upon opening at the same magnetic force, compared to the fixed connection of the armature and the valve needle. Another advantage is that separation of the engaged mass is achieved, so that the stopping force appearing in the sealing sheet is divided into two shocks.

In this amateur pre-travel concept, it is possible for the springs to be fitted with clearance. However, this permits the rotation of the armature during mounting and during operation. With this rotational motion and with respect to the possible flat deviation on the stopping surface, a change in the armature pre-travel appears, which influences the operating value of the valve, in particular the amount of fuel injected during operation. Thus, a clamped mounting is provided at least in relation to the spring member, and in the clamped mounting the spring member is clamped in the radial direction to the armature or spring force transmission means and, on the other hand, to the stationary member in the radial direction . Therefore, at the same time, an amateur pre-travel and an armature free rotation fixation can be realized. For this, the solution is very economical, since no additional holes, pins, other fixing members or fixing methods such as welding are required.

According to an embodiment of the valve, the spring member can be clamped in the radial direction to an armature or a separate spring force transmitting means. Upon clamping to the armature, a suitable structural embodiment of the armature is provided. If a spring force transmission means is provided, greater structural freedom is achieved in the practice of the armature and the possibility of a simpler implementation of the armature is achieved. The spring force transmission means may be connected to the armature in a suitable manner. This connection can be achieved, for example, by welding. In this case, the spring force transmitting means is not necessarily provided as an additional member used only for rotation fixing, because the spring force transmitting means can also be used to provide the spring force in a direction suitable for the armature.

The embodiment according to claim 2 has the advantage that the shape of the spring member allows the clamping to be arranged in particular in the end region, in particular in the final winding or windings. As a result, contact with other members can be prevented.

The embodiment according to claim 3 has the advantage that the simplification of the embodiment of the armature and / or at least one additional function can be implemented via the spring force transmitting means. For example, direction reversal of the spring force through the spring force transmitting means can be achieved. Further, the guide in the valve needle can be improved through the spring force transmitting means. For example, a preferred embodiment for enabling said reversal in the spring force direction is given in claim 4. In this case, the accommodating portion of the spring member capable of simple mounting can be additionally formed. In this regard, a preferred fixability for radial clamping is possible according to claim 5.

In another possible embodiment as claimed in claim 6, the spring member can be clamped onto the spring force transmitting means radially inward. In a preferred embodiment according to claim 7, the spring force transmitting means can simultaneously realize the guiding function. In the above embodiment of the valve, the advantage is achieved that the implementation of the armature is simplified, in particular because the armature can be implemented with greater tolerances.

The embodiment according to claim 8 has the advantage that direct clamping is possible to the armature. In this case, an outward clamping can be realized.

The improvement according to claim 9 provides a modification which enables clamping inward or outward in the stationary member. In this case, the supporting force can be adjusted by the shape and the spring rate in the relaxed state.

Claim 10 provides a variant which provides a preferred embodiment of a valve needle. In this case, a separate stop member can be welded, for example, to the valve needle. By the clamping of both sides of the spring force transmitting means, rotation locking without clearance of the armature can be realized.

Thus, in a possible embodiment, the spring inner diameter may be selected to be smaller than the diameter of the shoulder to enable clamping connection with the shoulder or the like. Upon mounting, the spring member can be rotated in the opposite direction of its winding direction and can be pushed onto the shoulder or the like at the same time. The spring inner diameter is enlarged by the rotational motion, and the shoulder or the like is inserted into the spring member wound until it reaches the predetermined end position. The spring member is then supported on the shoulder or the like by frictional engagement. The supporting force is adjusted by the oversizing and the spring rate of the spring member.

Thus, the spring outer diameter at the time of insertion of the spring member into a hole or the like is greater than the hole or the like in the starting state. Upon installation, the spring member is rotated in its winding direction and is simultaneously inserted into a hole or the like. Then, the outer diameter of the spring is reduced by the rotational motion, and the wound spring member is inserted into the hole or the like.

Therefore, a desirable possibility is given to achieve clearance-free rotation of the magnetic amateur in valves with amateur pre-travel, especially injection valves. A specific end position can be predetermined during installation. At the end position, in order to achieve an axial support which is provided during operation, in particular for restoration of the armature, axial support of the spring member can be provided.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein corresponding members are denoted by the same reference numerals.

1 is a schematic sectional view of a valve according to a first embodiment of the present invention;
Figure 2 is a schematic cross-sectional view of the valve shown in Figure 1, according to a second embodiment of the present invention;
3 is a schematic view of a valve portion shown in Fig. 1 III according to a third embodiment of the present invention;
4 is a schematic view of a valve portion shown in Fig. 1, according to a fourth embodiment of the present invention; Fig.
5 is a schematic view of a valve portion shown in Fig. 1, according to a fifth embodiment of the present invention; Fig.
6 is a schematic view of a valve portion shown in Fig. 1, according to a sixth embodiment of the present invention; Fig.

1 is a schematic cross-sectional view of a valve 1 according to a first embodiment. The valve 1 is used to meter the fluid. The valve 1 may in this case be formed as a fuel injection valve 1 in particular. A preferred application is a fuel injection system in which a plurality of the fuel injection valves 1 are formed as high-pressure injection valves 1 and used for directly injecting fuel into a corresponding combustion chamber of an internal combustion engine. In this case, liquid fuel or gaseous fuel may be used as the fuel.

The valve 1 includes an actuator 2, which includes a magnetic coil 3 and an armature 4. The magnetic circuit is closed by supplying the current to the magnetic coil 3 through the inner pole 5 of the actuator 2 and the housing 6 formed at least partly ferromagnetic so that the operation of the armature 4 is performed. In this case the actuation of the valve needle 7 again via the armature 4 is enabled and the valve needle is guided in the housing 6 movably along the longitudinal axis 8. The armature 4 is also guided along the longitudinal axis 8 in the valve needle 7.

The interaction of the armature 4 and the valve needle 7 is such that the relative movement of the armature 4 to the valve needle 7 between the stop members 9 and 10 in this case is enabled. The stop members 9, 10 can in this case be formed as stop rings 9, 10 and / or stop sleeves 9, 10. The stop surface 11 is formed on the stop member 9 and the end surface 12 of the armature 4 comes into contact with the front surface 11 in the starting state. The armature 4 also includes an additional end face 13 towards the stationary face of the stationary member 10.

The valve needle 7 is used for the operation of the valve closing body 15 which can be formed integrally with the valve needle 7. The valve closing body 15 interacts with the valve seat surface 16 to form a sealing sheet.

The valve 1 includes a spring port 20 and the spring port 20 includes a plurality of openings 21 and 22 formed in the circumference of the spring port 20 in this embodiment. Here, only the openings 21 and 22 are shown for the sake of simplifying the illustration. In addition, the armature 4 includes holes 23 and 24, which extend from the further end face 13 to the end face 12 and allow fluid to flow. The fluid may be a fuel to be metered, for example, and the fuel is supplied through the axial channel 25 and through the chamber 26 to the valve closed body 15.

The spring port 20 is welded to the armature 4 in this embodiment, which appears as a weld seam 27. [ A spring member 28 is disposed within the spring port 20 and the spring member 28 includes a suitable number of windings 29,30,31. In order to simplify the illustration, the windings 29 and 21 provided at the end in this case and the windings 30 provided between the windings 29 and 31 are shown.

In this embodiment, the stop member 9 is formed with a shoulder 35. An inner wall (36) is formed in the spring port (20). The spring member 28 is clamped to the shoulder 35 of the stopping member 9 on the one hand with at least the last winding 29 thereof. For this purpose, the final winding 29 is slightly elongated upon mounting, resulting in radial pre-stress. The spring member 28 is clamped on the inner wall 36 of the spring port 20 with at least the last winding 31 on the other hand. To this end, the final winding 31 is slightly compressed during mounting. Thus, in this embodiment, the spring member 28 is configured such that the final winding 29 is smaller than the diameter of the shoulder 35 so that the spring member 28 is stretched, . Alternatively, the winding 31 is formed to be larger than the inner diameter of the spring port 20 on the inner wall 36, and the spring member 28 is fitted in the spring port 20 by turning on and then frictionally engaged .

The stop member 10 can be welded to the valve needle 7, as shown by weld seam 37 in Fig. So that the stop member 9 can be welded to the valve needle 7 by means of the welding seam 38. [ In this case, the armature pre-travel is adjusted by the distance between the stop members 9, 10. The spring member 28 may be particularly conical. This conical implementation is illustrated with reference to FIG.

The valve 1 also includes a return spring 39 which acts on the valve needle 7 via the stop member 10. The return spring 39, Thus, the return spring 39 serves to provide a preliminary stress to the sealing sheet.

The starting position of the armature 4 at the stopping surface 11 is ensured by the spring member 28 during the operation of the valve 1. [ In this case, the armature 4 is subjected to an axial spring force acting in the opposite direction to the opening direction by the spring port 20. [ Therefore, at the start of the control of the valve 1, a complete armature pre-travel is provided. When an electric current is supplied to the magnetic coil 3, the armature 4 is accelerated first so that the armature can form a velocity impulse. If the armature 4 strikes the stop surface 14 of the stationary member 10 after passing through the armature pre-travel, a greater velocity reversal for opening the valve 1 is provided. The motion of the armature 4 including the valve needle 7 is limited by colliding against the inner pole 5. [ The closing of the magnetic coil 3 is made by the return spring 39 as a result of the currentless switching for closing. The spring member 28 places the armature 4 at its end again in its starting position.

Fig. 2 shows a schematic sectional view of the valve 1 shown in Fig. 1, according to a second embodiment. The spring member 28 is formed as a conically wound spring member 28 having an axially tapered envelope 45. In this case, the envelope 45 may be formed as a casing surface of a frustum.

The degree of conical formation of the spring member 28 depends on the diameter of the shoulder 35 and on the inner diameter of the inner wall 36 in the region of the winding 31. It is important that sufficient radial clamping is achieved by expansion of the windings 29 and compression of the windings 31.

Thus, in this embodiment, fixation is achieved by radial spreading in the shoulder 35 of the stop member 9, while fixation is achieved in the spring port 20 by radial compression.

Fig. 3 shows a portion of the valve 1 according to the third embodiment, which is indicated by III in Fig. In this embodiment, the armature 4 may be formed with a ring-shaped recess 46 in the form of a ring groove 46. At least the last winding (29) of the spring member (28) is inserted into the recess. In this case, the outer diameter of the winding 29 is predetermined to such an extent that radial compression is necessary to mount the spring member 28. [ In the mounted state, the spring member 28 is fixedly clamped in the ring-shaped recess 46 of the armature 4 in the radial direction by radial compression.

On the other hand, radially clamping is possible to the shoulder 47 of the stop member 10 by the spreading of the windings 31 of the spring member 28 at the stop member 10. [ At least in the winding 31 the spring member 28 is radially spread.

A ring-shaped recess 46 is provided in the end face 13 of the armature 4 in this embodiment because the spring member 28 is urged in the opening direction 40 ).

Fig. 4 shows a portion of the valve 1 according to the fourth embodiment, which is indicated by III in Fig. In this embodiment, the armature 4 is formed with a shoulder 48. The end surface 13 where the armature 4 strikes the stop surface 14 of the stop member 10 is formed in the region of the shoulder 48 in this embodiment. The winding 31 of the spring member 28 is clamped to the shoulder 47 in a manner similar to that of the third embodiment described with reference to Fig.

In addition, the spring member 28 is clipped to the shoulder 48 of the armature 4 in this embodiment. The clamping is effected by the spreading of at least the last winding (29) of the spring member (28). Clamping is in this case done radially inward at the shoulder 48. In addition, the spring member 28 is formed as a spring member 28 that is wound in the form of an abdomen with an enlarged, then tapered envelope 45 in this embodiment. This allows the spring member 28 to contact a part of the armature 4 or a part 49 of the stationary member 10, for example between the last windings 29, 31 provided on both sides thereof, . The spring member 28 is stretched at both ends or in the last windings 29 and 31 in this embodiment and is then connected to its partner 47 and 48 by frictional engagement, 47 or on the shoulder 48 of the armature 4.

Fig. 5 shows a portion of the valve 1 according to the fifth embodiment, which is indicated by III in Fig. In this embodiment, the armature 4 is formed with a ring-shaped recess 46, but the recess is different from the ring-shaped recess 46 of the armature 4 according to the third embodiment described with reference to Fig. 3 , And directly adjoins the valve needle (7). Thus, the ring-shaped recess 46 of the armature 4 is formed as the ring-shaped step 46. [ The stationary member 10 also includes an inner wall 51 in this embodiment and the inner wall 51 is formed on the basis of a ring-shaped recess 50 formed in the stationary member 10. The ring-shaped recess 50 is also directly adjacent to the valve needle 7. The spring member 28 is now radially clamped to the armature 5 outwardly by compression, at least on the last winding 29, into the ring-shaped recess 46. Correspondingly, the spring member 28 is clamped to the inner wall 51 of the stationary member 10 on the other hand at least radially outwardly by compression in the last winding 31. In this case, the inner wall 51 or the ring-shaped recess 50 of the spring member 28 and / or the stationary member 10 is provided with windings 30, such as windings 30 lying between the clamped windings 29, On the one hand, to the inner wall 51 and on the other hand to the valve needle 7.

With reference to Figures 1 and 2, embodiments in which a spring force transmission means 20 formed as a spring port 20 is provided, wherein the spring force transmission means 20 is provided with a spring member, do. In the embodiments described with reference to Figs. 3 to 5, the spring force transmission means is not provided. 6, a sixth embodiment is described in which a spring force transmitting means 60 formed as a guide sleeve 60 is provided, in which case the direction of the force of the spring member 28 is not reversed.

Fig. 6 shows a portion of the valve 1 according to the sixth embodiment, which is indicated by III in Fig. In this embodiment, a guide sleeve 60 is provided, and the guide sleeve 60 is guided on the valve needle 7. The guidance is then made between the stop surfaces 11, 14 of the stop members 9, 10 in this case. The armature 4 is fixedly connected to the guide sleeve 60 in a suitable manner. This embodiment has the advantage that the manufacture of the armature 4 is simplified because a guide clearance is given by pairing with the guide sleeve 60 and the valve needle 7. Further, the axial length of the guide sleeve 60 can be shortened to a required degree in a simple manner. The guide sleeve 60 includes a shoulder 61 and the shoulder 61 of the guide sleeve 60 projects axially beyond the end face 13 of the armature 4. The last winding 29 of the spring member 28 is radially clamped on the shoulder 61. In addition, the abdomen-like formation of the spring member 28 is predetermined as in the case of the fourth embodiment described with reference to Fig. The clamping in the stationary member 10 may also correspond to the embodiment described with reference to Fig.

The axial through hole 62 of the armature 4 is thus either used for guiding in the direct valve needle 7 according to the embodiment of the valve 1 or by means of spring force transmission means 60 ). The spring member 28 can also transmit the spring force required for restoration to the armature 4 directly or by means of spring force transmission means 20 and 60 and to support one of the stop members 9 and 10 . It is also possible to provide a number of spring members 28 that together provide the necessary restoring force. The guide sleeve 60 can be completely extended through the axial through hole 62 of the armature 4. In this embodiment, a stop can be made at the stop surfaces 11, 14 of the guide sleeve 60. [ On the other hand, alternate embodiments are possible in which the stop is made in the armature 4 and on the other hand in the guide sleeve 60.

Further, the stop members 9, 10 are not necessarily formed as separate parts. In particular, one of the stop members 9, 10 may be integrally formed with the valve needle 7.

Thus, there are several possibilities for achieving clearance-free rotation locking of the armature 4 with respect to the valve needle 7. In this case, the spring member 28 is clamped in the radial direction on the one hand to the armature 4 or the spring force transmitting means 20, 60 and on the other hand in the radial direction to the associated stop member 9, 10. The clamping is effected in such a manner that a clearance-free rotation of the armature 4 is realized on both sides.

The present invention is not limited to the embodiments described.

1 valve
2 Actuator
4 amateurs
7 valve needle
9, 10 stop members
20, 60 Spring force transmitting means
21, 22 opening
28 spring member
36 inner wall
45 in Belov
46 recess
47, 61 Shoulder
62 through hole

Claims (10)

1. A valve for a fluid metering valve (1), in particular a fuel injection valve for an internal combustion engine, comprising an electromagnetic actuator (2) and a valve needle (7) actuatable by an armature (4) of the actuator (2)
The armature 4 is movably guided in the valve needle 7 and is provided with at least one spring member 28 which is connected to the armature 4 either directly or via a spring force transmission Characterized in that the armature (4) is positioned against the valve needle (7) by means (20,60) against a stop member (9,10) disposed in the valve needle (7) 28) is clamped in the radial direction to the armature (4) or to the spring force transmitting means (20, 60) and on the other in the radial direction to the stationary member (9, 10) . The method according to claim 1,
The spring member 28 may be formed to have at least an approximately conical coil spring 28 and / or an axially tapered envelope 45, or the spring member 28 may be formed with a spring member 28 wound in the form of an abdomen Is formed to have an axially extending and then tapered envelope (45) as the valve (28). 3. The method according to claim 1 or 2,
The spring force transmitting means 20 and 60 are connected on the one hand to the armature 4 and the spring member 28 on the other hand is axially supported on the spring force transmitting means 20 and 60 Features a valve. 4. The method according to any one of claims 1 to 3,
Characterized in that the spring force transmission means (20) is formed as a spring port (20) with or without at least one opening (21, 22). 5. The method of claim 4,
Characterized in that the spring port (20) includes an inner wall (36) and the spring member (28) is clamped to the inner wall (36) in a radial direction in the spring port (20). 6. The method according to any one of claims 1 to 5,
Characterized in that a shoulder (61) is formed in said spring force transmission means (20,60) and said spring member (28) is radially clamped on said shoulder (61). The method according to claim 6,
The spring force transmission means 60 is formed as a guide sleeve 60 which extends through the axial through hole 62 of the armature 4 and is mounted on the valve needle 7 Is movably guided and connected to the armature (4). 3. The method according to claim 1 or 2,
A shoulder 48 is formed on the armature 4 and the spring member 28 is radially clamped on the shoulder 48 or a ring shaped recess 46 is formed on one end face of the armature 4 , And a spring member (28) is inserted into the recess, and the spring member (28) is radially clamped to the armature (4) in the recess. 9. The method according to any one of claims 1 to 8,
Characterized in that a shoulder (48) is formed in said stop member (9,10) and said spring member (28) is radially clamped on said shoulder (48) Shaped recesses 50 are formed in the recesses 11 and 14 and the spring members 28 are inserted into the recesses so that the spring members 28 are inserted into the recesses 9 and 10, Is clamped in the radial direction. 10. The method according to any one of claims 1 to 9,
The stop member 9 or 10 is connected to the valve needle 7 or integrally formed with the valve needle 7 and / or the spring member 28 is provided with no clearance of the armature 4 (9, 10) in the radial direction to the armature (4) or the spring force transmitting means (20, 60) and on the other in the radial direction Features a valve.

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