Abstract
An actuating unit for use in a steering stabilizing apparatus that includes a housing, a first transmission element and a second transmission element, wherein the first transmission element and the second transmission element protrude into the housing from the outside and are configured to be displaced along a restoring axis, wherein the first transmission element engages a first pressure element at the first end of the first transmission element and wherein the second transmission element engages a second pressure element at the first end of the second transmission element, and wherein the first pressure element and the second pressure element are disposed within a chamber of the housing and are subjected by a restoring arrangement to a restoring force acting along the restoring axis.
Claims
1.-15. (canceled)
16. An actuating unit for use in a steering stabilizing apparatus, comprising: a housing; a first transmission element; and a second transmission element; wherein the first transmission element and the second transmission element protrude into the housing from the outside and are configured to be displaced along a restoring axis; wherein the first transmission element engages a first pressure element at the first end of the first transmission element and wherein the second transmission element engages a second pressure element at the first end of the second transmission element; and wherein the first pressure element and the second pressure element are disposed entirely within the interior of the housing and are subjected by a restoring arrangement to a restoring force acting along the restoring axis.
17. The actuating unit as claimed in claim 16, wherein the restoring arrangement is under a preload in order to space the first pressure element apart from the second pressure element, wherein at least one of the transmission elements and the pressure elements is supported on at least one of the housing and a stop that is disposed substantially positionally fixedly relative to the housing.
18. The actuating unit as claimed in claim 17, wherein the restoring arrangement comprises at least one of a spring element and a fluid.
19. The actuating unit as claimed in claim 18, wherein the first transmission element comprises a first engagement section that is disposed outside of the housing and that is configured to transmit a force to a steering rod along the restoring axis in a first direction, and wherein the second transmission element comprises a second engagement section that is disposed outside of the housing and that is configured to transmit a force to the steering rod along the restoring axis in a second direction.
20. The actuating unit as claimed in claim 19, wherein the first engagement section is configured to transmit no force to the steering rod opposite to the first direction, and/or wherein the second engagement section is designed to transmit no force to the steering rod opposite to the second direction.
21. The actuating unit as claimed in claim 5, wherein the position of at least one of the first and the second engagement section is adjustable and is configured to be fixed by at least one of shape locking and force locking.
22. The actuating unit as claimed in claim 21, wherein a chamber is formed in the housing, wherein the first pressure element divides the chamber into a first volume and a second volume, and wherein the second pressure element divides the chamber into the first volume and a third volume.
23. The actuating unit as claimed in claim 22, wherein a higher pressure prevails in the first volume than in the second volume and in the third volume during operation of the actuating unit.
24. The actuating unit as claimed in claim 23, wherein ambient air pressure prevails in at least one of the second volume and in the third volume during operation of the actuating unit.
25. The actuating unit as claimed in claim 24, wherein at least one of the first pressure element comprises a first membrane and the second pressure element comprises a second membrane, and wherein the first membrane and the second membrane is disposed on the inner wall of the chamber of the housing in a fluid-tight manner.
26. The actuating unit as claimed in claim 25, wherein the first pressure element and the second pressure element comprise a supporting section, and wherein the restoring arrangement includes a spring element that is supported on both supporting sections.
27. The actuating unit as claimed in claim 18, wherein the restoring arrangement comprises at least one of a spring element and a fluid.
28. The actuating unit as claimed in claim 16, wherein the position of at least one of the first and the second engagement section is adjustable and is configured to be fixed by at least one of shape locking and force locking.
29. The actuating unit as claimed in claim 16, wherein a chamber is formed in the housing, wherein the first pressure element divides the chamber into a first volume and a second volume, and wherein the second pressure element divides the chamber into the first volume and a third volume.
30. The actuating unit as claimed in claim 28, wherein a higher pressure prevails in the first volume than in the second volume and in the third volume during operation of the actuating unit.
31. The actuating unit as claimed in claim 28, wherein ambient air pressure prevails in at least one of the second volume and in the third volume during operation of the actuating unit.
32. The actuating unit as claimed in claim 28, wherein at least one of the first pressure element comprises a first membrane and the second pressure element comprises a second membrane, and wherein the first membrane and the second membrane is disposed on the inner wall of the chamber of the housing in a fluid-tight manner.
33. The actuating unit as claimed in claim 16, wherein the first pressure element and the second pressure element comprise a supporting section, and wherein the restoring arrangement includes a spring element that is supported on both supporting sections.
34. A steering stabilizing apparatus for a commercial vehicle, comprising: an actuating unit; a steering rod; and two struts; wherein the actuating unit comprises a housing that is disposed positionally fixedly relative to an axle element; wherein the actuating unit is configured to subject both struts to the same magnitude of a force with the steering rod in a rest position relative to the axle element; wherein the struts are configured to transmit the force between the actuating unit and the steering rod; and wherein the actuating unit is configured, in the event of deflection of the steering rod from the rest position parallel to a restoring axis, to transmit a larger force to one of the struts than to the respective other strut when the steering rod is deflected from the rest position parallel to a restoring axis.
35. The steering stabilizing apparatus as claimed in claim 34, wherein the actuating unit is disposed on the same side of the axle element as the steering rod.
36. The steering stabilizing apparatus as claimed in claim 13, wherein the actuating unit comprises a chamber in which a fluid is disposed such that the actuating unit damps a displacement of the steering rod relative to the axle element by fluid friction.
37. The steering stabilizing apparatus as claimed in claim 36, wherein the struts are fixed to the steering rod and spaced apart from each other; wherein the first strut engages a first transmission element of the actuating unit; wherein the second strut engages a second transmission element of the actuating unit; wherein in the event of displacement of the steering rod from the rest position in a first direction, the second strut forces the second transmission element into the housing, and wherein in the event of displacement of the steering rod from the rest position in a second direction, the first strut forces the first transmission element into the housing.
38. The steering stabilizing apparatus as claimed in claim 34, wherein the actuating unit comprises a chamber in which a fluid is disposed such that the actuating unit damps a displacement of the steering rod relative to the axle element by fluid friction.
39. The steering stabilizing apparatus as claimed in claim 34, wherein the struts are fixed to the steering rod and spaced apart from each other; wherein the first strut engages a first transmission element of the actuating unit; wherein the second strut engages a second transmission element of the actuating unit; wherein in the event of displacement of the steering rod from the rest position in a first direction, the second strut forces the second transmission element into the housing, and wherein in the event of displacement of the steering rod from the rest position in a second direction, the first strut forces the first transmission element into the housing.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Further advantages and features of the present invention are revealed in the following description of preferred embodiments with reference to the accompanying figures. It will be understood that individual features that are only shown in one or a selection of embodiments can also be used in further embodiments, in particular if the reference characters of the features are the same and the feature is not prohibited in the corresponding embodiment for technical reasons. In the figures:
[0023] FIG. 1 shows a schematic view of a preferred embodiment of the steering stabilizing means according to the invention;
[0024] FIG. 2 shows an alternative preferred embodiment of the steering stabilizing means according to the invention;
[0025] FIG. 3A shows a partially sectional view of a preferred embodiment of a steering stabilizing means according to the invention in a rest position;
[0026] FIG. 3B shows a partially sectional view of the preferred embodiment of FIG. 3A in a first deflected position; and
[0027] FIGS. 4A, 4B show a preferred embodiment of the actuating unit according to the invention, wherein FIG. 4A shows the rest position and FIG. 4B shows a first deflected position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0028] The steering stabilizing means or arrangement shown in FIG. 1 comprises a steering rod 6, an actuating unit 4 and an axle element 10. The actuating unit 4 is made up of a housing 40, a first transmission element 41, a second transmission element 42 as well as a restoring means 7 disposed in the interior of the housing 40. In order to enable a favorable transmission of force from the restoring means 7 to the transmission elements 41, 42, the transmission elements 41, 42 each comprise a pressure element 43, 44. The pressure elements 43, 44 are preferably entirely disposed within a chamber 45 formed in the housing 40. In this case, the first pressure element 43 divides the chamber 45 preferably into a first volume 45A and a second volume 45B. Analogous to this, the second pressure element 44 preferably divides the chamber 45 into a third volume 45C and the first volume 45A. The first and second transmission elements 41, 42 can be displaced along a restoring axis A relative to the housing 40, wherein in the case of a displacement of the first transmission element 41 or the second transmission element 42 into the housing 40, the restoring means 7 is compressed in each case by the narrowing of the first volume or by the reduction of the distance between the first pressure element 43 and the second pressure element 44. Said compression of the restoring means causes a restoring force which is transmitted from the restoring means 7 to the pressure elements 43, 44. Owing to said restoring force, the actuating unit 4 ensures that a steering deflection of the steering rod 6 relative to the axle element 10 following termination of the steering process or the cornering of the commercial vehicle is returned to a rest position or neutral position of the steering rod 6. A failure element 71 and/or a fluid 72 is/are preferably used as the restoring means 7. The fluid 72 is preferably compressed air, because this is particularly simple to provide and can be obtained at any time from the surroundings or from the pneumatic air suspension system of a commercial vehicle and hence is conveniently and reproducibly available. For coupling the first volume 45A in the chamber 45 to the compressed air system of the commercial vehicle, the housing 40 preferably comprises an inlet 46. A compressed air line can be connected to said inlet 46, particularly preferably by means of a standard thread, wherein the compressed air line is preferably connected to the air spring bellows and the compressed air disposed therein in order to also provide the fluid 72 with a pressure adjusted depending on the weight of the commercial vehicle and on the resulting higher or lower pressure in the air springs. The first transmission element 41 comprises a first engagement section 41A, which on the one hand designed to a pass on a displacement of the steering rod in a second direction R.sub.2 to the first transmission element 41 and on the other hand to transmit the restoring force of the restoring means 7 acting on the transmission element 41 in turn to the steering rod 6. Furthermore, a first strut 81, which in the preferred embodiment of FIG. 1 is fixed to the steering rod, is used for further transmission of the force between the transmission element 41 and the steering rod 6. The first strut 81 and the second strut 82 as well as the first engagement section 41A and the second engagement section 42A are in this case positioned on the steering rod and the transmission elements 41, 42 such that in the event of displacement of the steering rod 6 in the first direction R.sub.1 or in the second direction R.sub.2, a respective transmission element 41 or 42 is forced into the housing 40 of the actuating unit 4, whereas the respective other transmission element 41, 42 of the respective strut 81, 82 allows free movement in the direction in which the steering rod 6 is moving relative to the axle element 10.
[0029] FIG. 2 shows a further embodiment of the steering stabilizing means, wherein in contrast to the embodiment shown in FIG. 1, the struts 81, 82 are not fixed to the steering rod 6, but to the transmission elements 41, 42. For the transmission of force from the transmission elements 41, 42 to the steering rod 6 and vice-versa, the steering rod comprises a first engagement section 61 on the steering side and a second engagement section 62 on the steering side, which are designed similarly to the engagement sections 41A and 42A in FIG. 1 to transmit a force of the actuating unit 4 to the steering rod 6 and vice-versa.
[0030] FIG. 3A shows a partly sectional top view of a preferred embodiment of the steering stabilizing means with the adjacent elements and systems of the chassis of the commercial vehicle. In the case of the self-steering axle represented, the straight-ahead direction runs upwards in the figure. FIG. 3A shows the rest position for this, i.e. the position of the steering rod 6 for straight-line travel, whereas FIG. 3B shows the position of the steering stabilizing means during cornering. With the straight-ahead position shown in FIG. 3A of the actuating unit and the steering rod 6, the first strut 81 and the second strut 82 are preferably subjected to the same force by the transmission elements 41, 42 (see FIG. 1 or FIG. 4A) of the actuating unit 4, whereby the steering axle and thereby also the wheels of the commercial vehicle are held in the straight-ahead position. In the case of the position shown in FIG. 3B of the steering stabilizing means when cornering, only the first strut 81 engages the corresponding first engagement section 41A of the first transmission element 41, whereas the second strut 82 is spaced apart from the second engagement section 42A as it runs freely along the second transmission element 42. At the same time, in the chamber of the actuating unit 4 the restoring means 7 is correspondingly displaced to the left and is subjected to a force, wherein the restoring means 7 acts with a restoring force on the first transmission element 41 and thus on the first strut 81. The details of the actuating unit 4 in the neutral position or straight-ahead travel position as well as in the cornering position are shown in FIGS. 4A and 4B. in the case of the embodiment shown in FIG. 3A and FIG. 3B, the first transmission element 41 and the second transmission element 42 are preferably implemented as threaded rods, at least in the region in which the first engagement section 41A or the second engagement section 42A engages, wherein the first engagement section 41A as well as the second engagement section 42A preferably comprises an internal thread that can be screwed onto the transmission element 41 and secured in a certain position, for example tightened. This enables the actuating unit 4 and the engagement thereof with the steering rod 6 to be adjusted using fewer hand actions.
[0031] FIG. 4A shows the actuating unit 4 in the straight-ahead position already shown in FIG. 3A. As further details of the actuating unit 4, it is shown that the pressure elements 43 and 44 comprise a first and a second membrane 43A, 44A and preferably also a first and a second supporting section 43A and 44A. The first membrane 43A is used in this case to divide the chamber 45 in the housing 40 of the actuating unit 4 into a first volume 45A and a second volume 45B. The first supporting section 43B is used to support the spring element 71, wherein it comprises a collar-shaped edge that prevents the spring element 71 from slipping transversely to the restoring axis A. Analogous to this, the second pressure element 44 comprises a second membrane 44A that separates a third volume 45C from the first volume 45A. Particularly preferably, the first volume 45A is fluidically connected via the inlet 46 to the compressed air system of the commercial vehicle. In particular, in this case a higher pressure preferably prevails in the first volume 45A than in the second volume 45B and than in the third volume 45C. The overpressure in the first volume 45A as well as the spring element 71 both subject the first pressure element 43 and also the second pressure element 44 to a force that tends to space the two pressure elements 43, 44 apart from each other. In the straight-ahead position of the actuating unit 4, the first pressure element 43 and the second pressure element 44 are each supported on the end faces, which means in other words on the inner walls of the housing 40 of the actuating unit 4 shown on the right and left in the figure. In other words, the restoring means 7, which in the embodiment shown in FIG. 4A preferably comprises a spring element 71 and a fluid 72, acts on the first pressure element 43 in a first direction R.sub.1 and the second pressure element 44 in a second direction R.sub.2. In the transition region to the rod-shaped region of the first or second transmission elements 41, 42 the first pressure element 43 as well as the second pressure element 44 each comprises a plate-shaped section that supports the membrane 43A, 44A in particular. The first membrane 43A as well as the second membrane 44A are preferably made of a rubber material. In particular, a fiber-reinforced rubber material can preferably also be used for this in order to be able to withstand the large forces acting in the actuating unit 4.
[0032] FIG. 4B shows the actuating unit in the state in which the steering rod 6 is in a deflected position relative to the axle element 10 (not shown), wherein the second transmission element 42 is forced along the restoring axis A into the chamber 45 of the actuating unit 4. It is shown schematically that in this case ambient air flows into the third volume 45C in order to fill the space increased by the displacement of the second pressure element 44 on the one hand. On the other hand, the space of the first volume 45A decreases, wherein the compressed air disposed there escapes through the inlet opening 46 into the compressed air system of the commercial vehicle and the spring element 71 between the first pressure element 43 and the second pressure element 44 is compressed. In the state shown in FIG. 4B, the first pressure element 43 is supported on the right side of the housing 40 of the actuating unit 4 in the figure. Once the restoring force of the restoring means 7 overcomes the force transferred to the second transmission element 42 from the steering rod, the second transmission element 42 is displaced back in the left direction in the figure, until finally the rest position of the actuating unit shown in FIG. 4A is reached. Instead of the membranes 43A and 44A shown in FIGS. 3A, 3B, 4A and 4B, the pressure elements could also be implemented as simple pistons that slide in the interior of the chamber 45 of the actuating unit 4 and accordingly bound the first volume 45A.
REFERENCE CHARACTER LIST
[0033] 4—actuating unit [0034] 6—steering rod [0035] 7—restoring means [0036] 10—axle element [0037] 40—housing [0038] 41—first transmission element [0039] 41A—first engagement section [0040] 42—second transmission element [0041] 42A—second engagement section [0042] 43—first pressure element [0043] 43A—first membrane [0044] 43B—first supporting section [0045] 44—second pressure element [0046] 44A—second membrane [0047] 44B—second supporting section [0048] 45—chamber [0049] 45A—first volume [0050] 45B—second volume [0051] 45C—third volume [0052] 46—inlet [0053] 61—first engagement section on the steering side [0054] 62—second engagement section on the steering side [0055] 71—spring element [0056] 72—fluid [0057] 81—first strut [0058] 82—second strut [0059] A—restoring axis [0060] R.sub.1—first direction [0061] R.sub.2— second direction
