[0001] The invention relates to a valve assembly for an injection valve and an injection
valve.
[0002] Injection valves are in widespread use, in particular for internal combustion engines
where they may be arranged in order to dose the fluid into an intake manifold of the
internal combustion engine or directly into the combustion chamber of a cylinder of
the internal combustion engine.
[0003] Injection valves are manufactured in various forms in order to satisfy the various
needs for the various combustion engines. Therefore, for example, their length, their
diameter and all the various elements of the injection valve being responsible for
the way the fluid is dosed may vary in a wide range. In addition to that, injection
valves may accommodate an actuator for actuating a needle of the injection valve,
which may, for example, be an electromagnetic actuator or piezoelectric actuator.
[0004] In order to enhance the combustion process in view of the creation of unwanted emissions,
the respective injection valve may be suited to dose fluids under very high pressures.
The pressures may be in case of a gasoline engine, for example, in the range of up
to 200 bar and in the case of a diesel engine in the range of up to 2000 bar.
[0005] The object of the invention is to create a valve assembly for an injection valve
and an injection valve which is simply to be manufactured and which facilitates a
reliable and precise function.
[0006] This object is achieved by the features of the independent claim. Advantageous embodiments
of the invention are given in the sub-claims.
[0007] According to a first aspect the invention is distinguished by a valve assembly of
an injection valve, the valve assembly comprising a valve body including a central
longitudinal axis, the valve body comprising a cavity with a fluid outlet portion,
a valve needle axially moveable in the cavity, and a sealing element. The sealing
element has an inner fixing element and an outer fixing element, wherein the inner
fixing element is at least partially arranged inside the outer fixing element. The
outer fixing element has an outer surface coupled with the valve body and the inner
fixing element has a cavity forming an inner surface coupled with the valve needle,
and the inner fixing element and the outer fixing element are sealingly coupled by
a layer of an elastic material. The sealing element is sealingly coupling the valve
body with the valve needle and enables an axial movement of the valve needle relative
to the valve body.
[0008] This has the advantage that a sealing element with a good sealing performance can
be obtained. A further advantage is that mechanical forces from outside the valve
assembly on the valve needle can result in a movement of the valve needle due to the
elastic properties of the sealing element. Furthermore, the construction of the sealing
element can be very simple and consequently, it is possible to obtain low costs for
the sealing element.
[0009] In an advantageous embodiment of the invention, the inner fixing element comprises
a section formed as a hollow circular cylinder. In a further advantageous embodiment
of the invention, the outer fixing element comprises a section formed as a hollow
cylinder. These cylindrical forms allow a simple manufacturing of the inner and the
outer fixing element. Furthermore, hollow circular cylinders are highly appropriate
for the use in components with circular cross sections as in injection valves.
[0010] In a further advantageous embodiment of the invention the layer is consisting of
rubber. This allows the use of a material which has a long term stability in view
of tightness against fluids like fuels. Furthermore, the layer may be produced very
simply and for very low costs. Preferably the layer consists of viton (Registered
Trade Mark). Viton is a synthetic rubber and fluoropolymer elastomer which has a high
stability against aggressive chemicals like fuels.
[0011] In a further embodiment of this invention, the rubber is a vulcanized rubber adhesively
coupling the inner fixing element to the outer fixing element. By this a secure coupling
between the layer and the fixing elements can be achieved.
[0012] In a further advantageous embodiment of the invention, the inner fixing element is
coupled to the valve needle by a first welding connection and the outer fixing element
is coupled to the valve body by a second welding connection. This enables a coupling
of the sealing element in the valve assembly which can have a very high stability.
[0013] According to a second aspect the invention is distinguished by an injection valve
with a chamber arranged in the valve body and an actuator unit arranged in the chamber
in a way that the valve needle is actuable by the actuator unit and the sealing element
prevents a fluid flow between the cavity and the chamber. By these means a good sealing
between the chamber with the actuator unit and the cavity is achieved to avoid a fluid
flow from the fluid bearing cavity to the chamber with the actuator unit which is
sensitive against fluid contact, in particular, if the fluid is a fuel.
[0014] Exemplary embodiments of the invention are explained in the following with the aid
of schematic drawings. These are as follows:
Figure 1, an injection valve in a longitudinal section view,
Figure 2, a valve assembly of the injection valve in a longitudinal section view,
and
Figure 3, a sealing element of the valve assembly of the injection valve in a longitudinal
section view.
[0015] Elements of the same design and function that appear in different illustrations are
identified by the same reference characters.
[0016] An injection valve 10 (figure 1) that is used as a fuel injection valve for an internal
combustion engine, comprises a housing 12, a valve assembly 14 and an actuator unit
16.
[0017] The housing 12 has a tubular shape. The actuator unit 16 is inserted into the housing
12 and comprises a piezo actuator, which changes its axial length depending on a control
signal applied to it. The actuator unit 16 may, however, also comprise another type
of actuator, which is known to a person skilled in the art for that purpose. Such
an actuator may be, for example, a solenoid.
[0018] The valve assembly 14 comprises a valve body 20 with a central longitudinal access
A and a cavity 24 which is axially led through the valve body 20. On one of the free
ends of the cavity 24, a fluid outlet portion 28 is formed, which is closed or open
depending on the axial position of a valve needle 22. The injection valve 10 further
has a fluid inlet portion 26 which is arranged in the housing 12 and which is hydraulically
coupled to the cavity 24 and a not shown fuel connector. The fuel connector is designed
to be connected to a high pressure fuel chamber of an internal combustion engine,
the fuel is stored under high pressure, for example, under the pressure of about 200
bar.
[0019] The valve body 20 has a valve body spring rest 32 and the valve needle 22 comprises
a valve needle spring rest 34, both spring rests 32, 34 supporting a spring 30 arranged
between the valve body 20 and the valve needle 22.
[0020] The injection valve 10 is of an outward opening type. In an alternative embodiment
the injection valve 10 may be of an inward opening type. Between the valve needle
22 and the valve body 20 a bellow 36 is arranged which is sealingly coupling the valve
body 20 with the valve needle 22. By this a fluid flow between the cavity 24 and a
chamber 38 is prevented. Furthermore, the bellow 36 is formed and arranged in a way
that the valve needle 22 is actuable by the actuator unit 16.
[0021] Figure 2 shows a sectional view of the valve assembly 14 with a sealing element 42.
Figure 3 shows the sealing element 42 in a longitudinal section in an enlarged detailed
view.
[0022] The sealing element 42 has a cylindrical inner fixing element 44 and cylindrical
outer fixing element 48 coaxially arranged to the inner fixing element 44. The inner
fixing element 44 has a cavity 45 which forms an inner surface 46, the outer fixing
element 48 has an outer surface 50. The inner fixing element 44 is partially arranged
inside the outer fixing element 48. Between the inner fixing element 44 and the outer
fixing element 48 a layer 52 is arranged. The layer 52 is of an elastic material and
is sealingly coupling the inner fixing element 44 and the outer fixing element 48.
The inner fixing element is coupled to the valve needle 22 by the inner surface 46
and a first welding connection 54. The outer fixing element 48 is coupled with the
valve body 20 by the outer surface 50 and a second welding connection 56. By these
means a stable coupling of the sealing element 42 with the valve body 20 and the valve
needle 22 may be enabled.
[0023] The layer 52 consists of rubber, in particular of a vulcanized rubber which is adhesively
coupling the inner fixing element 44 to the outer fixing element 48. By this a secure
connection between the layer 52 and the fixing elements 44, 48 is enabled. Furthermore,
the layer 52 made of a rubber enables a movement of the valve needle 22 in axial direction
relative to the valve body 20. In a preferred embodiment, the rubber is viton (Registered
Trade Mark), which is a rubber with a high resistiveness against fluids such as fuels
thereby enabling a long cycle time of the injection valve.
[0024] The inner fixing element 44 and the outer fixing element 48 are preferably made of
stainless steel, as this material enables a long life time of the fixing elements
44, 48 as of their little corrosiveness.
[0025] The sealing element 42 has a length D and an outer diameter D. The ratio of the length
L to the outer diameter D of the sealing element 42 is preferably equal or less than
one. This is equivalent with that the sealing element 42 is disk-shaped. This embodiment
has the advantage that the layer 52 made of rubber can be very easily vulcanized.
Furthermore, if the length L of the sealing element 42 is small the length of the
valve assembly 14 can be small as well which is an advantage if only little space
is available. Furthermore, the side loads of the valve needle relative to the valve
body 20 and the friction of the valve needle 22 are small.
[0026] In the following, the function of the injection valve 10 will be described in detail:
The fuel is led from the fluid inlet portion 26 in the housing 12 towards the valve
body 20 and then towards the fluid outlet portion 28. The fluid flow from the fluid
outlet portion 28 to the chamber 38 with the actuator unit 16 is prevented by the
sealing element 42.
[0027] The valve needle 22 prevents a fluid flow through the fluid outlet portion 28 in
the valve body 20 in a closing position of the valve needle 22. Outside of the closing
position of the valve needle 22, the valve needle 22 enables the fluid flow through
the fluid outlet portion 28.
[0028] In the case that the actuator unit 16 has a piezoelectric actuator, the piezoelectric
actuator may change its axial length if it gets energized in an expansion duration
of some micro-seconds. By changing its length the actuator unit 16 may effect a force
on the valve needle 22. Due to the elastic properties of the layer 52 of the sealing
element 42 the valve needle 22 is able to move in axial direction out of the closing
position. Outside of the closing position of the valve needle 22 there is a gap between
the valve body 20 and the valve needle 22 at an axial end of the injection valve 10
facing away from of the actuator unit 16. The gap forms a valve nozzle 29.
[0029] The spring 30 can force the valve needle 22 via the valve needle spring rest 34 towards
the actuator unit 16. In the case when the actuator unit 16 is de-energized the actuator
unit 16 shortens its length. Due to the elasticity of the layer 52 of the sealing
element 42 the spring 30 can force the valve needle 22 to move in axial direction
in its closing position. It is depending on the force balance between the force on
the valve needle 22 caused by the actuator unit 16 and the force on the valve needle
22 caused by the spring 30 whether the valve needle 22 is in its closing position
or not.
1. Valve assembly (14) of an injection valve (10), the valve assembly (14) comprising
- a valve body (20) including a central longitudinal axis (A), the valve body (20)
comprising a cavity (24) with a fluid outlet portion (28),
- a valve needle (22) axially movable in the cavity (24),
- a sealing element (42) with
an inner fixing element (44) and an outer fixing element (48), wherein the inner fixing
element (44) is at least partially arranged inside the outer fixing element (48),
the outer fixing element (48) having an outer surface (50) coupled with the valve
body (20) and the inner fixing element (44) having a cavity (45) forming an inner
surface (46) coupled with the valve needle (22), and the inner fixing element (44)
and the outer fixing element (48) being sealingly coupled by a layer (52) of an elastic
material,
with the sealing element (42) sealingly coupling the valve body (20) with the valve
needle (22) and enabling an axial movement of the valve needle (22) relative to the
valve body (20).
2. Valve assembly (14) in accordance with claim 1 with the inner fixing element (44)
comprising a section formed as a hollow circular cylinder.
3. Valve assembly (14) in accordance with claim 1 or claim 2 with the outer fixing element
(48) comprising a section formed as a hollow circular cylinder.
4. Valve assembly (14) in accordance with one of the preceding claims with the layer
(52) consisting of rubber.
5. Valve assembly (14) in accordance with claim 4 with the rubber being a vulcanized
rubber adhesively coupling the inner fixing element (44) to the outer fixing element
(48).
6. Valve assembly (14) in accordance with one of the preceding claims with the inner
fixing element (44) being coupled to the valve needle (22) by a first welding connection
(54) and the outer fixing element (48) being coupled to the valve body (20) by a second
welding connection (56).
7. Injection valve (10) comprising the valve assembly (14) in accordance with one of
the preceding claims.
8. Injection valve (10) in accordance with claim 7 with a chamber (38) arranged in the
injection valve (10) and an actuator unit (16) arranged in the chamber (38) in a way
that the valve needle (22) is actuable by the actuator unit (16) and the sealing element
(42) preventing a fluid flow between the cavity (24) and the chamber (38).