COIL ASSEMBLY FOR AN ACTIVELY CONTROLLED DAMPING VALVE ASSEMBLY OF A VEHICLE

Abstract

The present disclosure relates to a coil assembly for an actively controlled damping valve assembly of a vehicle, comprising: a mating surface for mating with an inner surface of a cavity of a valve housing of the damping valve assembly, and a fixation member configured for axially and rotationally locking the coil assembly with said valve housing, wherein the fixation member is adapted with an outer surface of substantially circular geometry comprising two or more protuberances circumferentially spaced apart and defining press-fit interference points with the inner surface of the cavity such that the coil assembly is axially and rotationally lockable to the valve housing irrespective whether the coil assembly is inserted into the valve housing in a first axial rotational orientation or an at least second axial rotational orientation relative the valve housing different from the first axial rotational orientation. An actively controlled damping valve assembly or a vehicle and a method of mounting the coil assembly in such damping valve assembly is also disclosed.

Claims

1. A coil assembly for an actively controlled damping valve assembly of a vehicle, comprising: a mating surface for mating with an inner surface of a cavity of a valve housing of the damping valve assembly, and a fixation member configured for axially and rotationally locking the coil assembly with said valve housing, wherein the fixation member is adapted with an outer surface of substantially circular geometry comprising two or more protuberances circumferentially spaced apart and defining press-fit interference points with the inner surface of the cavity such that the coil assembly is axially and rotationally lockable to the valve housing irrespective whether the coil assembly is inserted into the valve housing in a first axial rotational orientation or an at least second axial rotational orientation relative the valve housing different from the first axial rotational orientation.

2. The coil assembly according to claim 1, wherein protuberances are circumferentially equally spaced apart.

3. The coil assembly according to claim 1, comprising three protuberances.

4. The coil assembly according to claim 1, wherein at least one of said protuberances comprises a curved outer surface defining a press-fit interference surface with the inner surface of the cavity.

5. The coil assembly according to claim 1, wherein at least two of said protuberances comprises a curved outer surface defining a press-fit interference surface with the inner surface of the cavity wherein said at least two curved outer surfaces have the same radius of curvature.

6. The coil assembly according to claim 4, wherein said curved outer surface or at least one of said curved outer surfaces extends about 10-50 degrees in a circumferential direction of the fixation member.

7. The coil assembly according to claim 1, wherein the coil assembly is adapted to be insertable into the valve housing irrespective of its axial rotational orientation.

8. The coil assembly according to claim 1, wherein the fixation member is made of a material comprising metal, preferably metal which is magnetically conductive.

9. The coil assembly according to claim 8, wherein the fixation member is adapted in shape, size and material for closing a magnetic circuit of the coil assembly.

10. The coil assembly according to claim 1, wherein the fixation member comprises a disc shape and is coaxially arranged in the coil assembly.

11. The coil assembly according to claim 1, wherein the fixation member is an integrated member of the coil assembly.

12. An actively controlled damping valve assembly for a vehicle, comprising: a valve housing defining a cavity, an actively controlled damping valve adapted to be arranged into said valve housing, and the coil assembly according to claim 1, wherein the valve housing is configured to deform, preferably elastically, by the two or more protuberances of the coil assembly, thereby rotationally and axially locking the coil assembly with said valve housing.

13. A method for mounting a coil assembly according to claim 1 into a cavity of a valve housing for an actively controlled damping valve assembly, comprising: inserting the coil assembly into the cavity so that the mating surface of the coil assembly mates with the inner surface of the cavity of the valve housing, and deforming the valve housing wall with the two or more protuberances circumferentially spaced apart, and axially and rotationally locking the coil assembly to said valve housing thereby fixating by press-fit interference points with an inner surface of the cavity at the two or more protuberances of the coil assembly, wherein the step of inserting the coil assembly into the cavity of the valve housing involves inserting the coil assembly in either a first axial rotational orientation or an at least second axial rotational orientation different from the first axial rotational orientation.

14. The method according to claim 13, wherein the coil assembly is adapted to be insertable into the valve housing irrespective of its axial rotational orientation.

15. The method according to claim 13, wherein the valve housing is deformable by means of the two or more protuberances such that the force ratio (R.sub.F) of the axial force (F.sub.A) to the radial force (F.sub.R,) exerted at each press-fit interference point, is about 0.4-0.8.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The invention will in the following be described in more detail with reference to the enclosed drawings, wherein:

[0030] FIGS. 1A-1C show a coil assembly according to one embodiment of the invention when inserted into a cavity of a valve housing of an actively controlled damping valve assembly;

[0031] FIG. 2a-2b shows a cross sectional side view of the coil assembly when inserted into a cavity of a valve housing of an actively controlled damping valve assembly;

[0032] FIGS. 3A-3C show the coil assembly according to one embodiment of the invention;

[0033] FIGS. 4a-4c shows the fixation member according to one embodiment of the invention;

[0034] FIG. 5 shows a cross sectional view of the coil assembly as it is being inserted into a cavity of a valve housing of an actively controlled damping valve assembly;

[0035] FIG. 6 shows steps of a method according to one embodiment of the invention for mounting a coil assembly into a cavity of a valve housing for an actively controlled damping valve assembly.

DESCRIPTION OF EMBODIMENTS

[0036] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, like numbers refer to like elements.

[0037] FIGS. 1A-1C show a coil assembly 1 according to one embodiment of the invention when inserted into a cavity of a valve housing 20 of an actively controlled damping valve assembly 2. In particular, FIG. 1A shows a perspective view of said arrangement 1, 2. FIG. 1B shows a side view of said arrangement 1, 2. FIG. 1C shows a top view of said arrangement 1, 2. As can be seen in these figures, the valve housing 20 illustrated has a substantially cylindric shape. The coil assembly 1 is adapted to be inserted into an end opening of said valve housing 20 and adapted to being fixated rotationally and axially by means of a fixation member (not shown in FIGS. 1A-1C). Although the figures depict the valve housing 20 and coil assembly 1 as having generally cylindric shapes, the valve housing 20 and coil assembly 1 is not limited to such shapes only. In other embodiments, the housing and coil may have other shapes such as polygonal or oval.

[0038] FIG. 2 shows a cross sectional side view of the coil assembly 1 when inserted into a cavity of a valve housing 20 of an actively controlled damping valve assembly 2. The coil assembly 1 is further depicted alone, without the valve housing in FIGS. 3A-3C. FIG. 3A depicts a perspective view, FIG. 3B a side view and FIG. 3C a cross-sectional sideview.

[0039] As shown in FIGS. 2a-3C, the coil assembly 1 generally extends along an axis R. The coil assembly 1 comprises a coil member 14. As seen in FIG. 2, the coil member 14 is in the depicted embodiment symmetrically arranged about the axis R. The coil assembly 1 comprises a mating surface 11 for mating with an inner surface 201 of a cavity of the valve housing 20 of the damping valve assembly 2. The mating surface 11 and the inner surface 201 are each formed to fit together and may, as is illustrated, each have a cylindric shape. However, the coil assembly 1 is adapted such that a gap is defined between the mating surface 11 and the inner surface 201 of the valve housing 20. The coil assembly 1 may be adapted so that a predetermined gap is present or such that substantially no gap is present at all between the mating surface 11 and the inner surface 201. The mating surface is defined by a body 11 enclosing the coil 14. The body 11 comprises a tube shape with a center hole defining a space for a plunger to move axially along axis R under influence of magnetic force generated by the coil member 14.

[0040] The coil assembly 1 further comprises a fixation member 12 configured for axially and rotationally locking the coil assembly 1 with said valve housing 20. The fixation member 12 is adapted with an outer surface 120 of substantially circular geometry comprising two or more protuberances 1201 circumferentially spaced apart. The two or more protuberances 1201 define press-fit interference points P with the inner surface 201 of the cavity such that the coil assembly 1 is axially and rotationally lockable to the valve housing 20. Moreover, said locking may be irrespective whether the coil assembly 1 is inserted into the valve housing 20 in a first axial rotational orientation or an at least second axial rotational orientation relative the valve housing 20 different from the first axial rotational orientation. The first and second axial rotational orientations represent different axial rotational orientations of the coil assembly 1 about the axis R. The first and second axial rotational orientations are related to each other by means of a rotation of the coil assembly 1 about axis R. Thus, the coil assembly 1 is not limited to being inserted and fixated to the valve housing 20 in a particular orientation. This allows increased degree of freedom when inserting the coil assembly 1 into the valve housing 20. In particular, the coil assembly 1 may in one embodiment be adapted to be insertable into the valve housing 20 irrespective of its axial rotational orientation. The coil assembly 1 may thus be free to being inserted and fixated to the valve housing in any axial rotational orientation. This allows for even greater degree of freedom when inserting the coil assembly 1 into the valve housing 20.

[0041] Upon insertion of the coil assembly 1 into the cavity of the valve housing 20, the protuberances 1201 engage with the inner surface 201. As mentioned, these protuberances define press-fit interference points P with the inner surface 201. In the embodiments depicted in the figures, the fixation member 12 is disc shaped wherein the protuberances 1201 extend radially out from an outer surface 120 of the disc. The fixation member 12 further comprises a through-hole. The through-hole is coaxially arranged with the hole of the body enclosing the coil member 14. These form a space which extends along the axis R.

[0042] In the illustrated example in FIG. 2a, the fixation member 12 is arranged between the portion of the body enclosing the coil member 14 and an intermediate portion 13 of the coil assembly 1. The intermediate portion 13 may be any portion of the coil assembly 1 that is situated above (as depicted) the fixation member. Above in this context should be interpreted as on an opposite side of the fixation member than the coil member 14. The intermediate portion 13 of the coil assembly has a shape and size which is adapted to mesh with the inner surface 201 of the valve housing. The intermediate portion of may further comprise an aperture 130 for defining a space where a sealing member 135 may be arranged. The sealing member 135 may e.g. be an O-ring or other sealing flexible material. The sealing member 135 may be arranged at any position between the valve housing 20 and the intermediate portion 13 of the of the coil assembly 1. Preferably the sealing is arranged on an outer side of the fixation member 12 so as to protect the fixation member from dirt and moist that may enter from the outer side into the coil assembly. The coil assembly further has electrical connectors in a top portion for being able to e.g. energize the coil.

[0043] In an embodiment of FIG. 2b, the fixation member 12 is arranged between the body enclosing the coil member 14 and the body 11 defining an end cap 13 of the coil assembly 1. Also, the sealing member 135 is arranged between the end cap 13 and the valve housing 20.

[0044] FIGS. 4a-4c shows the fixation member according to one embodiment of the invention. As mentioned, the fixation member 12 is disc shaped and comprises an outer surface 120 of substantially circular geometry. The particular embodiment depicted in FIGS. 4A-4C comprises three protuberances 1201, 1202, 1203 which are circumferentially spaced apart. Moreover, the protuberances 1201, 1202, 1203 each comprise a curved outer surface which define a press-fit interference surface with the inner surface 201 of the cavity rather than just press-fit interference points. Moreover, the curved surfaces of the protuberances 1201, 1202, 1203 have the same radius of curvature. The curved surfaces of the protuberances 1201, 1202, 1203 further extends about 40-50 degrees in a circumferential direction. However, the curved surfaces of the protuberances 1201, 1202, 1203 may extend anywhere between 10-20 degrees, 20-30 degrees, 30-40 degrees, 40-50 degrees or more in a circumferential direction depending on how big press-fit interference surface is desired. Moreover, as mentioned, the fixation member 12 comprises a through-hole 122. The fixation member 12 further comprises a cut-out region 121. The edge adjacent to the cut-out region 121 defines a rectangular.

[0045] In a particular embodiment, the fixation member 12 is made of a material comprising metal, preferably a metal which is magnetically conducting. This is advantageous as it allows for closing the magnetic circuit generated by the coil member 14 when a current runs therethrough. This may prevent excessive magnetic field leakage. Moreover, the fixation member 12 may be further adapted in shape, size and material for closing the magnetic circuit of the coil assembly 1.

[0046] As stated, the fixation member 12 is arranged between the body 11 enclosing the coil member 14 and an intermediate portion 13 of the coil assembly 1 (FIG. 2a) or and end cap (FIG. 2b). The fixation member 12 may be an integrated member of the coil assembly 1. In other embodiments, the fixation member may be a separate member that is mountable onto the coil assembly 1.

[0047] FIG. 5 shows a cross sectional view of the coil assembly 1 as it is being inserted into a cavity of a valve housing 20 of an actively controlled damping valve assembly 2. As the coil assembly 1 is inserted into the cavity of the valve housing 20, the fixation member 12 starts to engage with the inner surface 201 of the valve housing 20 by means of the protuberances 1201, 1202, 1203 (best shown in FIGS. 4a-4c). When the end cap or intermediate portion 13 of the coil housing 1 is properly seated in a final mounting position relative the valve housing 20, the protuberances 1201, 1202, 1203 radially press onto the inner surface 201. This causes the valve housing 20 to deform, preferably elastically deform. Thus, the coil assembly 1 is held in place by the valve housing 20 pressing on the protuberances 1201, 1202, 1203, thereby defining said press-fit interference points or surfaces. At each press-fit interference point, there is a radial force F.sub.R and an axial force F.sub.A exerted. The force ratio R.sub.F of the axial force F.sub.A to the radial force F.sub.R may be 0.4-0.8. This may further ensure that the coil assembly 1 is held securely in place to the valve housing 20. As an example, nominal axial force FA may be 600-2100 N and the nominal radial force F.sub.R may be 1500-5250 N.

[0048] As stated, FIGS. 1, 2A-2C, 5 show a part of an actively controlled damping valve assembly 2 for a vehicle, more specifically a portion of the valve housing 20 of the actively controlled damping valve assembly 2. The damping valve assembly comprises the valve housing 20 defining a cavity, an actively controlled damping valve adapted to be arranged into said valve housing 20, and the coil assembly 1 previously detailed. The valve housing 20 is configured to deform, preferably elastically, by the two or more protuberances 1201, 1202, 1203, of the coil assembly 1, thereby rotationally and axially locking the coil assembly 1 with said valve housing 20. The vehicle is preferably an automobile.

[0049] FIG. 6 shows steps of a method S0 according to one embodiment of the invention for mounting a coil assembly 1 into a cavity of a valve housing 20 for an actively controlled damping valve assembly 2. The method comprises the steps of inserting S1 the coil assembly 1 into the cavity so that the mating surface 11 of the coil assembly 1 mates with the inner surface 201 of the cavity of the valve housing 20. The method S0 further comprises the step of deforming S2 the valve housing wall with two or more protuberances 1201, 1202, 1203 circumferentially spaced apart. The method S0 further comprises the step of axially and rotationally locking S3 the coil assembly 1 to said valve housing 20 thereby fixating by press-fit interference points with an inner surface of the cavity of the two or more protuberances of the coil assembly 1. The step of inserting S1 the coil assembly 1 into the cavity of the valve housing 20 involves inserting the coil assembly 1 in either a first axial rotational orientation or an at least second axial rotational orientation different from the first axial rotational orientation.

[0050] The coil assembly 1 is adapted to be insertable into the valve housing 20 irrespective of its axial rotational orientation.

[0051] The valve housing 20 is deformable by means of the two or more protuberances 1201, 1202, 1203 such that the force ratio R.sub.F of the axial force FA to the radial force F.sub.R exerted at each press-fit interference point is about 0.4-0.8.

[0052] In the drawings and specification, there have been disclosed preferred embodiments and examples of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for the purpose of limitation, the scope of the invention being set forth in the following claims.