# Patent

## Title
Vehicle transportable rotor blade of a wind-energy turbine

## Abstract

A wind power system rotor blade has an inboard end and an outboard end adapted for being transported by a transport vehicle. In order to make the transport of the rotor blade possible on highways, even when it exceeds the usual profile height of underpasses and bridges (freeway bridges, etc.), a wind power system rotor blade is proposed having an inboard and an outboard end and comprising: a rotor blade root at the inboard end; an intermediate device fixedly coupled to the rotor blade root at one end provided for a rotatably coupling to a rotary support member at the other end for allowing a rotation of the rotor blade around the rotor blade's longitudinal axis in relation to the rotary support member; and locking means for captively locking the rotor blade in a support frame toward the outboard end of the rotor blade.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
The present application is a divisional of and claims priority under 35 U.S.C. §120 from U.S. patent application Ser. No. 10/886,945, filed Jul. 8, 2004, which is a continuation-in-part of and claims priority under 35 U.S.C. §120 from International Application Serial No. PCT/EP02/14700, filed on Dec. 21, 2002 and designating the United States, which claims priority from German (DE) Application Serial No. 102 00 401.3, filed on Jan. 8, 2002, all of which are assigned to the same assignee as the present application and incorporated herein by reference in their entireties


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wind power system rotor blade having an inboard and an outboard end adapted for being transported by a transport vehicle.
2. Description of the Related Art
Such transport vehicles have long been known and are used especially in the transporting of large pipes, e.g., tower pipes of wind power systems.
The advantage of such transport vehicles, consisting of the tractor/trailer system, is substantially that the outer dimensions of the entire transport can be held to a sufficient size with a justifiable expense and in particular the transport height can be held so low that it is regularly possible to travel through underpasses, tunnels, bridges and the like.
DE 199 38 017 teaches a device for receiving oversize loads. This device is a low-bed trailer on which the oversize load can be pivoted, if necessary and desired, from a horizontal position into an almost vertical position.
However, in the field of wind power technology even previously known transport vehicle systems are reaching their limits because the outer dimension of the structural units such as, e.g., tower segments, rotor blades, etc. have become so great that the use of such transport systems is no longer readily possible. The suggestion has already been made that newly designed zeppelin vehicles be used for transporting large and bulky loads; however, the transport with such systems has not yet been tested and, moreover, very high transport costs must be reckoned with in the case of such systems.
BRIEF SUMMARY OF THE INVENTION
The present invention provides a rotor blade aimed at the problem of making possible the transport on highways thereof, even when the rotor blade exceeds the usual profile height of underpasses and bridges (freeway bridges, etc.).
This problem is solved with a rotor blade with the means with the features according to claim 1. Advantageous further developments are described in the dependent claims.
The rotor blade in accordance with an embodiment of the invention is especially suited for transporting by having a length greater than 40 m and a maximum width of more than 5 m.
This great transport width signifies in the normal instance that even the normal roadway profile is exceeded as regards the width of a freeway lane with such a transport. The large width of a rotor blade exceeds the width of a freeway lane. The rotor blade should therefore also be transported in a “vertical” position so that the maximum width of the rotor blade therefore represents the maximum height of the entire transport. However, if such a transport must pass through a freeway bridge it can occur that the transport height is too great and passage under a freeway bridge (the height is usually 4 m or 5 m) is impossible.
If the entire rotor blade is rotated prior to passing under the freeway bridge, it is placed on its “side” in such a manner that the rotor blade is no longer vertical at its maximum width location, but rather it is placed approximately 90° to the side so that it is now possible to travel under a freeway bridge. After the passage through the freeway bridge, the rotor blade can be rotated back into its previous position by means of the rotating device so that the traffic on other freeway lanes is no longer hindered, which is very likely during the passage through the freeway bridge.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an isometric view of a transport vehicle holding a rotor blade in the vertical position according to one embodiment of the present invention.
FIG. 2 is an isometric view of the transport vehicle of FIG. 1 holding the rotor blade in a rotated horizontal position.
FIG. 3 is an isometric view of a holding device rotatably mounted on the trailer of the transport vehicle of FIG. 1 holding the rotor blade in the vertical position.
FIG. 4 is an isometric view of the holding device of FIG. 3 holding the rotor blade in a rotated horizontal position.
FIG. 5 is an isometric view of an alternative embodiment of the holding device of FIG. 3 with the rotor blade not present.
FIG. 6 is an isometric view of a holding device operably connected to the tractor of the transport vehicle of FIG. 1 and receiving the rotor blade at the rotor blade root.
FIG. 7 is an isometric view of the frame of the holding device of FIG. 6 captively receiving a rotary support that is rotatably connected to the rotor blade root.
FIG. 8 is an isometric view of the rotary support and the rotor blade root of FIG. 7 with the frame of the holding device of FIG. 6 not present and showing the rotary drive.



DETAILED DESCRIPTION OF THE INVENTION
The present detailed description is directed toward embodiments of a wind power system rotor blade transportation means and a rotor blade. Several details of certain embodiments of the invention are set forth in the following description and illustrated in FIGS. 1-8. One skilled in the art, however, will understand that the present invention may have additional embodiments and may be practiced without several of the details described in the following description and illustrated in the figures.
FIG. 1 illustrates a rotor blade 16 being transported by means of a transport vehicle 10 according to one embodiment of the present invention such that the rotor blade maximum width (W) (which is, for example, 5 m or more) is positioned vertically. The transport vehicle 10 is comprised of a tractor 12, a rotor blade 16, and a trailer 14. The tractor 12 has a rotor blade holding device 30, and the trailer 14 includes a trailer rotor blade holding device 20.
FIG. 2 illustrates the transport vehicle 10 of FIG. 1 with the rotor blade 16 being transported in a rotated horizontal position such that the rotor blade thickness (T) is positioned vertically and the rotor blade maximum width (W) is now positioned horizontally. When a freeway bridge 18 or other obstacles with a vertical height limitation are encountered, the entire rotor blade 16 is selectively rotated by approximately 90°, as illustrated in FIG. 2, so that it is possible to pass under the freeway bridge 18 or other height-limited obstacle without contact.
In another embodiment of the present invention it is also readily possible for the roadway passage profile of roads to be measured and appropriately programmed or stored in a databank in such a manner that if the cargo height during transport is too great for passing under a height-limited obstacle, an appropriate pivoting into a horizontal or side position is automatically initiated or is displayed to the vehicle driver so that he can initiate rotation of the cargo.
FIG. 3 illustrates, according to one embodiment of the present invention, the position of the trailer rotor blade holding device 20 before the rotation of the rotor blade. In this embodiment of the present invention, one or more radial frames 22 support the rotor blade holding frame 23. Furthermore, the radial frames 22 rest on plurality of rollers 24 to allow the rotation of the rotor blade 16. The plurality of rollers 24 are mounted on a trailer attach frame 26. Those skilled in the art will appreciate other embodiments of the present invention that allow for the rotation of the rotor blade 16 at the trailing end. For example, the rollers 24 may be mounted on the radial frames 22 and roll inside a radial track with a radius that corresponds to the rotation of the rotor blade 16.
FIG. 4 illustrates the position of the trailer rotor blade holding device 20 and the rotor blade 16 after the rotation. The flanges 25 are incorporated at the ends of radial frames 22 to prevent over-rotation of the rotor blade 16 at the trailing end. Moreover, the rollers 24 are mounted on the trailer attach frame 26. Also shown in FIG. 4 are Guide rollers 27, which maintain the radial motion of the radial frames 22 about the rotor blade 16 rotational axis.
FIG. 5 illustrates another embodiment of the trailer rotor blade holding device 20 with the rotor blade 16 not present. In this embodiment of the present invention, the trailer attach frame 26 of the trailer rotor blade holding device 20 is mounted on a rotatable frame mount 28, which is rotatably mounted on the trailer 14 to allow for easier maneuvering through curves and turns.
FIG. 6 illustrates, according to one embodiment of the present invention, a view of the tractor 12 of the transport device 10 with a holding device 30 for receiving the rotor blade 16 at the rotor blade root 40. In this embodiment of the present invention, the tractor rotor blade holding device 30 comprises a tractor attach frame 32 and a cradle 34. The cradle 34 is fixedly coupled to the tractor attach frame 32 and receives the rotor blade root 40.
FIG. 7 illustrates in more detail the reception of the rotor blade root 40 by the cradle 34. In this embodiment of the present invention, since the diameter of the rotor blade 16 is very large (more than 2 m), an intermediate device 42 is positioned between the cradle 34 and the rotor blade 16. The intermediate device 42 is rotatably coupled to butt joint ring 36, which is captively received by the cradle 34. The intermediate device 42 is fixedly coupled to the rotor blade 16 such that when rotated, the intermediate device 42 prompts the rotation of the rotor blade 16. In addition, a plurality of stiffening members 44 may be incorporated on the transition regions between the rotor blade 16 and the intermediate device 42 to prevent structural deformation of the rotor blade root 40.
FIG. 8 illustrates the rotor blade root of FIG. 7 with the cradle 34 not present. The rotation of the intermediate device 42 is selectively prompted by the rotary drive 38. Upon approaching a freeway bridge 18, as shown in FIGS. 1 and 2, or other obstacles with a height limitation, the transport vehicle operator may actuate the rotary drive 38 via remote control means inside the tractor cabin to initiate the rotation of the intermediate device 42, which in turn rotates the rotor blade 16. Alternatively when the roadway passage profile of roads are measured and appropriately programmed or stored in a databank, the rotary drive 38 may be prompted automatically upon approaching obstacles with height limitation. These figures also show that the intermediate piece comprises a rotary drive and an appropriate rotary support.
The intermediate piece is fastened to a holding frame of the tractor on the side facing away from the rotor blade.
The trailer rotor blade holding device 20 located on the trailer is rotatably mounted and follows the rotation of the rotor blade by means of the rotary drive on the intermediate device 42 that rotates the rotor blade 16. Alternatively, the trailer rotor blade holding device 20 may also comprise a controlled rotary drive that is coordinated in such a manner as to correspond with the rotary drive 38 that rotates the intermediate device 42.
According to one alternative embodiment the butt joint ring 36 is the ring that will bolt the blade 16 to the wind power device. It is rigidly fixed to the cradle 34. The drive motor 38 and gearing are the same that will be used to feather the blade while in operation on the wind power device. Thus, the same structure that will be used to connect and turn the blade on the final wind power installation will be used to connect and rotate the blade while being transported.
The trailer rotor blade holding device 20, as shown according to one embodiment of the invention in FIGS. 3 through 5, may be adapted to the particular profile of the rotor blade at the rotor blade holding frame 23. The rotor blade may comprise one or more passages 29 that provide for means to lock the blade in place. For example, in one embodiment as shown in FIG. 3, the passage 29 may comprise a lug that mates with the rotor blade holding frame lugs 21, through which appropriate holding bolts may extend so that the rotor blade cannot slip off the holding device of the trailer under any circumstances. Those skilled in the art will appreciate alternate means for securing the rotor blade to the rotor blade holding frame 23 on the trailer rotor blade holding device 20 without deviating from the scope and spirit of the present invention.
As can be further recognized, the holding device provided on the trailer is itself rotatably mounted in order to make it easier to drive through curves.
In addition, the transport vehicle 10 of the present invention may include, in one embodiment of the invention as illustrated in FIG. 7, one or more warning devices 46. Warning devices 46 can sense a potential collision of the transported cargo with a passable limitation (to the side, above or below) and report this to the driver cabin in the instance of such a danger of collision so that the transporting driver can effect a timely pivoting of the cargo such that a collision of the cargo with a profile limitation of the roadway is no longer possible.
The rotating of the cargo can take place when the vehicle is standing or also during a slow or moderate travel of the vehicle.
All of the above U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and/or listed in the Application Data Sheet, are incorporated herein by reference, in their entirety.
From the foregoing it will be appreciated that, although specific embodiments of the invention have been described herein for purposes of illustration, various modifications may be made without deviating from the spirit and scope of the invention. Accordingly, the invention is not limited except as by the appended claims.

## Claims

1. A system that includes a wind power installation rotor blade having an inboard and an outboard end, the system comprising:
a rotor blade root at the inboard end;
an intermediate device fixedly coupled to the rotor blade root at one end and rotatably coupled to a rotary support member at an other end;
a plurality of stiffening members to support the rotor blade at an intermediate device transition region;
means for captively locking the rotor blade in a frame toward the outboard end of the rotor blade;
one or more warning devices to alert a driver of a potential obstacle with a height restriction;
means for selective rotating the intermediate device; and
means for automatically rotating the intermediate device.

2. A system that includes a wind power installation rotor blade having an inboard and an outboard end, the system comprising:
a rotor blade root at the inboard end; and
an intermediate device fixedly coupled to the rotor blade root at one end and provided for a rotatably coupling to a rotary support member at an other end, in a manner to enable a rotation of entire said rotor blade around the rotor blade's longitudinal axis in relation to the rotary support member, the intermediate device configured to keep the rotor blade in a substantially horizontal orientation as the rotor blade rotates around the rotor blade's longitudinal axis and as the rotor blade is being transported.

3. The system that includes the rotor blade according to claim 2 wherein the intermediate device is flange mounted to the rotor blade root.

4. The system that includes the rotor blade according to claim 2 further comprising a rotary support member rotatably coupled to the intermediate device, the rotary support member coupleable to a holding frame of a tractor.

5. The system that includes the rotor blade according to claim 4, wherein the rotary support member and the intermediate device are arranged to rotate the rotor blade with respect to the holding frame.

6. The system that includes the rotor blade according to claim 2, wherein the intermediate device supports the rotor blade in the substantially horizontal orientation while the outboard end of the rotor blade is supported by a trailer rotor blade holding device.

7. The system that includes the rotor blade according to claim 2, wherein the system is a transportation system that enables transportation of the rotor blade along a roadway while the rotor blade is in the substantially horizontal orientation.

8. A system that includes a wind power installation rotor blade having an inboard and an outboard end, the system comprising:
a rotor blade root at the inboard end;
an intermediate device fixedly coupled to the rotor blade root at one end and provided for a rotatably coupling to a rotary support member at an other end, in a manner to enable a rotation of entire said rotor blade around the rotor blade's longitudinal axis in relation to the rotary support member; and
locking means for captively locking the rotor blade to a support frame toward the outboard end of the rotor blade.

9. The system that includes the rotor blade according to claim 8 wherein the locking means enables a bolt of the support frame to extend through the rotor blade.

10. The system that includes the rotor blade according to claim 9 wherein the locking means includes a lug to mate with a lug of the support frame.

11. A system that includes a wind power installation rotor blade having an inboard and an outboard end, the system comprising:
a rotor blade root at the inboard end;
an intermediate device fixedly coupled to the rotor blade root at one end and provided for a rotatably coupling to a rotary support member at an other end, in a manner to enable a rotation of entire said rotor blade around the rotor blade's longitudinal axis in relation to the rotary support member; and
at least one warning device to sense a potential obstacle with a spatial restriction and to report a danger of collision.

12. The system that includes the rotor blade according to claim 11, further comprising control means for causing a rotation of the rotor blade upon a warning generated by the at least one warning device for preventing a collision.

13. A system that includes a wind power installation rotor blade having an inboard and an outboard end, the system comprising:
a rotor blade root at the inboard end; and
an intermediate device fixedly coupled to the rotor blade root at one end and provided for a rotatably coupling to a rotary support member at an other end, in a manner to enable a rotation of entire said rotor blade around the rotor blade's longitudinal axis in relation to the rotary support member, wherein the intermediate device includes a rotary drive to drive the rotation of the rotor blade in relation to the rotary support member.

14. A system that includes a wind power installation rotor blade having an inboard and an outboard end, the system comprising:
a rotor blade root at the inboard end; and
an intermediate device fixedly coupled to the rotor blade root at one end and provided for a rotatably coupling to a rotary support member at an other end, in a manner to enable a rotation of entire said rotor blade around the rotor blade's longitudinal axis in relation to the rotary support member, wherein the intermediate device, wherein the intermediate device includes a plurality of stiffening members to stiffen the rotor blade.

15. The system that includes the rotor blade according to claim 14, further comprising a locking device to captively lock the rotor blade to a support frame toward the outboard end of the rotor blade, wherein the locking device enables a bolt of the support frame to extend through the rotor blade.

16. The system that includes the rotor blade according to claim 14 wherein said rotation of the rotor blade is enabled during transport of said rotor blade by a vehicle.

17. A system that includes a wind power installation rotor blade having an inboard and an outboard end, the system comprising:
a rotor blade root at the inboard end; and
an intermediate device fixedly coupled to the rotor blade root at one end and provided for a rotatably coupling to a rotary support member at an other end, in a manner to enable a rotation of the rotor blade around the rotor blade's longitudinal axis in relation to the rotary support member; and
at least one warning device to report a danger of collision with an obstacle having a spatial restriction.