JPH0735817B2 - Shaft coupling element - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention comprises a fiber composite material having layers of different fiber orientations, for attaching two axially extending flange portions or shaft portions to each other. Of a polygonal member having a threaded hole, the shaft coupling element receiving elastic axial displacement and angular displacement.

[Conventional technology]

Elements of this kind serve to accommodate relatively small angular changes and axial displacements of the drive line and must be suitable to accept large rotational torques in a better flexible state.

A shaft coupling element of the type mentioned above is known from West German Patent 3108007C2. In the case of this patent, the web area of the polygonal member is composed of a large number of sheet metal elements with free spaces in which the walls are parallel to one another, the sheet metal elements being overlaid in the end area and providing a compact connection area. Form. The fiber directions of the layers of the sheet metal element are alternately ± 45 ° and 0/90 °, and the strength and rigidity of the joint element are high.

[Problems to be Solved by the Invention]

In this case, the coupling element of the above-described construction is therefore a spatial formation of a longer extension in the axial direction and exhibits an excessive rigidity. Based on the selectable arrangement of the individual layers and the set structure, it was found that during all types of deformation, the fiber could be loaded far away from the bending centerline in the tensile direction each time. This results in the particular disadvantage that the deformation counters the high resistance.

Therefore, the object of the present invention is to solve the above-mentioned problems, to retain the rotation torque capacity that is not impaired better, to show good flexibility, and to reduce the elongation of the internal fiber to a small extent. To create a shaft coupling element of the kind mentioned.

[Means and Actions for Solving the Problems]

A solution for this is to provide a simple polygonal member having a symmetrical structure with respect to the mid-plane, said polygonal member comprising a plurality of thin linear web areas and a plurality of reinforcing eye areas, A plurality of web regions have a central fiber layer having a fiber direction in the length direction of the web and an outer fiber layer having a fiber direction of ± 30 ° to ± 60 °, especially ± 45 ° with respect to the length direction of the web. And further comprising a plurality of reinforcing eye areas which are continuous to the side surfaces of the plurality of web areas at a boundary perpendicular to the length direction of the web, and the fiber layers of the plurality of web areas are located in adjacent eye areas in each case. It is characterized in that the fiber layers in the plurality of web regions that have migrated are pressed against each other more strongly than the fiber layers in the plurality of adjacent eye regions and are in close contact with each other.

In the case of the web region constructed according to the invention, the effect is obtained that the elongation of the fibers is limited based on the selected orientation both in tensile and in bending.
The simple construction of the polygonal member in the mid-plane provides great flexibility due to the large torsion load capacity. What is also essential is to make the boundaries of the eye area at right angles to the length of the web. Doing so produces a clean bending curve in the web area so that torsional forces are not introduced by length differences, as is the case with areas with known elements. In addition, due to the larger overall length of the flexible region, bending causes less material loading with respect to all dimensions of the element than known elements.

It is particularly preferred to say that the fibrous layers of the web migrate into the adjacent eye area, which does not create weak points in the web-to-eye transition area. In this case, each uses a substantially C-shaped single element, which comprises one web portion and two eye areas following it. In a particularly preferred embodiment, the transition from the web to the eye area is provided with a radius when viewed in longitudinal section in order to avoid a notch effect. Due to the increased material thickness, the eye area has an additional layer in the middle of any fiber direction.

The thickness difference between the strong eye area and the tensile strength tough web area can be increased by pressing the web area harder to bring the fibrous layers together. The thickness ratio is in the range of 1: 3 to 1: 5, and despite the screw holes, no weak spots are observed due to the migration of fibers between the eye and web regions.

In the present invention, it is still preferable to insert a bush into the screw hole, and it is particularly preferable to employ a hexagonal polygonal member.

〔Example〕

 A preferred embodiment is shown in the drawing.

In FIGS. 1 and 2, a polygonal member having a thinner web area 1 and a thicker eye area 2 can be seen. In this case, both regions are always bounded at right angles to the length of the web. The transition section is characterized by an Earl 3. The generally triangular and outwardly rounded eye area 2 has a threaded hole 4 which can be interconnected to a star connection or joint flange. In cross section, the outer fiber layer 6 of one web is ±
The fiber direction is 45 °, while the central fiber layer 5 has a fiber direction that is purely longitudinal. Both fiber types always migrate to the next eye area. In the eye region 2, an additive layer or a filling layer 7 is added.

FIG. 3 again shows the central fiber layer 5 oriented in the longitudinal direction,
A web region 1 with an outer fiber layer 6 forming ± 45 ° is shown. In one web region 1, the central fibrous layer 5 occupies about 50% of the total thickness and the outer fibrous layer 6 in each case about 25% of the total thickness.
%, The total thickness being particularly preferably about 1.5 mm.

FIG. 4 is a longitudinal cross-sectional view of the web region, where the left shows the elongation of the whole web that is always realized, the right shows the elongation of the corresponding fiber, and (a) is the tensile load,
(B) shows a case of bending load, and (c) shows a case of overlapping load of tension and bending. The selected layer construction limits the fiber elongation and keeps it within its acceptable range.

By the way, in FIG. 4, the symbol ε indicates the elongation rate of the fiber or the web, and here, it is a value obtained by dividing the elongation amount by the length. F indicates tensile stress, and M _B indicates bending moment.

The shape of the individual elements is shown in FIG. It shows the shape of the element which can have any possible fiber angle with respect to the length of the web. In a generally C-shaped configuration, the element comprises a web area with two connected eye areas.

FIG. 6 again shows the single element in magnified view. That is, an outer fiber layer comprising a central fiber layer 5 containing fibers oriented in the length direction and a single layer 6a, 6b on which fibers forming an angle of ± 45 ° with respect to the length direction of the web are placed in different directions. 6 and.

(Effects of the Invention) With the shaft coupling element of the present invention, the web region and the eye region are contacted with each other at a right angle boundary, and the respective fiber directions are the length direction of the web in the combination of the central fiber layer and the outer fiber layer. A very thin web region was formed by setting the depth direction to be ± 30 ° to ± 60 °, and the combination formed a simple polygonal member. The polygonal member retains the rotational torque capacity, has good flexibility, rigidity, and thinness, so that the elongation of the fiber inside is reduced to a small extent, and a shaft coupling element excellent in space and cost is provided. I was able to do it.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a shaft coupling element of the present invention as seen from the axial direction, FIG. 2 is a side view of an embodiment of a shaft coupling element of the present invention, and FIG. FIG. 4 is an enlarged detailed plan view and cross-sectional view of one embodiment of the web region of FIG. 4, FIG. 4 is an explanatory view of one embodiment showing various load states in the web region and fibers of the present invention, and FIG. FIG. 6 is a plan view of an example of the previous single element, and FIG. 6 is an enlarged plan view and a partially enlarged cross-sectional view of the example of the single element before the assembly process. [Symbols in the drawing] 1 ... Web area, 2 ... Eye area, 3 ... R 4 ... Screw hole, 5 ... Central fiber layer, 6 ... Outer fiber layer 7 ... Filled layer

Claims (6)

[Claims] 1. A resilient polygonal member comprising fiber composite material having layers of different fiber orientations and having threaded holes for attaching two axially extending flange portions or shaft portions to each other. In a shaft coupling element that receives axial and angular displacements, a simple polygonal member having a symmetrical structure with respect to an intermediate plane is provided, and the polygonal members have a plurality of thin straight web regions (1). And a plurality of eye areas (2) for reinforcement, the plurality of web areas having a central fiber layer (5) having a fiber direction in the length direction of the web, and ± 30 with respect to the length direction of the web.
An outer fiber layer (6) in the fiber direction of 60 ° to ± 60 °, and a plurality of reinforcing eye regions (2) are provided at a plurality of web regions (1) with a boundary perpendicular to the length direction of the web. The fiber layers (5, 6) of the plurality of web areas (1), which continue to the side surface, migrate into the adjacent eye areas (2) each time, and the fiber layers () of the plurality of web areas (1) A shaft coupling element characterized in that 5,6) are pressed more strongly than the fiber layers of a plurality of adjacent eye regions (2) and are in close contact with each other. 2. In one web region (1), the central fibrous layer (5) occupies about 50% of the total thickness and the outer fibrous layer (6) occupies about 25% of the total thickness in each case. Total thickness, especially, about
The shaft coupling element according to claim 1, wherein the shaft coupling element has a size of 1.5 mm. 3. A plurality of web areas (1) transition to a plurality of eye areas (2) via a radius (3) in a longitudinal section, as claimed in claim 1 or 2.
A shaft coupling element according to item. 4. A filling layer (7) in the plurality of eye areas (2).
Claims 1 to 3, characterized in that
The shaft coupling element according to any one of paragraphs. 5. A bush according to claim 1, wherein a bush is inserted into the screw hole.
A shaft coupling element according to item. 6. A shaft coupling element according to claim 1, wherein the polygonal member is a hexagon.