COMPONENT FOR CONNECTING A CLAMPING HOLDER TO A SHAFT

Abstract

In a component for connecting a shaft to a clamping holder that can receive a rotor, the clamping holder is able to be inserted into a cup-shaped housing and is able to be fixed there by fasteners. On the housing base of the housing is a connector for connecting the housing to the shaft in a torque-proof manner. The fasteners are arranged with their base surface on the outer lateral surface of the housing, and can be brought into engagement with the clamping holder by bores present in the housing. The fasteners have at least one recess in the base surface, such that they rest with their base surface on the outer lateral surface only in some regions.

Claims

1. A component (1) for connecting a shaft to a clamping holder (6) that can receive a rotor, the component having a cup-shaped, thin-walled housing (2) into which the clamping holder (6) can be inserted, and can there be fixed by means of fastening means (13), having on the housing base (3) of the housing (2) connection means (7) for connecting the housing (2) to the shaft in a torque-proof manner, wherein the fastening means (13) are arranged with their base surface (17) on the outer lateral surface (12) of the housing (2) and can be brought into engagement with the clamping holder (6) by means of bores present in the housing (2), and have at least one recess (18) in the base surface (17), such that they rest with their base surface (17) on the outer lateral surface (12) only in some regions.

2. The component (1) according to claim 1, wherein the fastening means (13) comprise clamping blocks (15) and screws (14), and the clamping blocks (15) have the at least one recess (18) in their base surface (17).

3. The component (1) according to claim 2, wherein each clamping block (15) has at least one through-hole (16) for the screw (14), and the base surface (17) is cut out in the region of the through-hole (16).

4. The component (1) according to claim 3, wherein the recesses (18) each have a diameter that is greater than the diameter of the through-hole (16).

5. The component (1) according to claim 2, wherein the clamping blocks (15) have a rectangular shape and are arranged on the outer lateral surface (12) in such a manner that their longitudinal axis is coaxial with the longitudinal axis of the housing (2).

6. The component (1) according to claim 5, wherein the recess (18) of the base surface (17) extends along the longitudinal axis over the entire length of the clamping block (15), and its width is greater than the diameter of the through-hole (16).

7. The component (1) according to claim 3, wherein several through-holes (16) are present in the clamping blocks (15) along the longitudinal axis.

8. The component (1) according to claim 1, wherein the connection means (7) are receptacles or recesses to which corresponding connecting means of the shaft can be connected.

9. The component (1) according to claim 1, wherein the housing wall has a thickness of 0.3 mm to 3 mm.

10. The component (1) according to claim 1, wherein the component (1) comprises at least three fastening means (13) arranged at a distance from one another on the outer lateral surface (12).

11. The component (1) according to claim 2, wherein the base surface (17) of the clamping blocks (15) is concave or flat in shape.

Description

[0024] The invention is explained in more detail below with reference to embodiments which are illustrated in the drawings. In the drawings:

[0025] FIG. 1 is a perspectival view of a cup-shaped component with an integrated clamping holder,

[0026] FIG. 2 is a longitudinal section of the component according to FIG. 1, and

[0027] FIG. 3 is an enlarged view of a clamping block.

[0028] FIG. 1 is a perspectival view of a cup-shaped component with an integrated clamping holder, FIG. 2 is a longitudinal section of the component according to FIG. 1, and FIG. 3 is an enlarged view of a clamping block. The cup-shaped component 1 has a hollow cylindrical housing 2 with a housing base 3; together with its lateral surface 4, it forms a space 5 for receiving a clamping holder 6. The clamping holder 6 can be inserted in a simple manner via the open side of the housing 2. The lateral surface 4 of the housing 2 is thin-walled and can, for example, consist of metal sheet, such that the component 1 has a low weight and also has a high torsional stiffness.

[0029] Connection means 7 are provided on the housing base 3; the component 1 can be connected to a rotary drive by means of the connection means. This connection can be produced by screwing, for example, a flange connection of a shaft which is connected to the drive, designed as a connecting means, into the corresponding connection means 7, which is designed as a receptacle or recess, in the housing base 3 in a torque-proof manner. Such a shaft can, for example, be a thin, elastic spin shaft which is mounted in a spin test stand for driving a rotor.

[0030] The clamping holder 6 shown by way of example has a central recess 8 for a rotor or a rotor journal. The clamping holder 6 shown is a clamping holder 6 compensating for centrifugal force, in which centrifugal segments 9 widen outwards and, in doing so, press clamping segments 11 inwards via leaf springs 10 to clamp the rotor. The received rotor can be clamped by the fact that a force is exerted on the centrifugal segments 9 in the direction of the recess 8 from the outside, and the clamping segments 11 are thereby moved outwards via the leaf springs 10. This is merely an example of a clamping holder, since the component according to the invention is provided for a plurality of differently designed clamping holders, in which an impairment of the unclamping or clamping process by the component accommodating the clamping holder is to be prevented. The component is particularly suitable for clamping holders compensating for centrifugal force.

[0031] In order to fix the clamping holder 6 in the housing 2, fastening means 13 are arranged at a distance from one another on the outer lateral surface 12. In the example shown, the fastening means 13 are arranged close to the open cup end, such that the center of gravity of the component 1 lies at a small distance from the clamping plane. The fastening means 13 can comprise screws 14 and clamping blocks 15. The screws 14 project through through-holes 16 in the clamping blocks 15 and through corresponding bores in the housing, and are brought into engagement with corresponding bores in the clamping holder 6. For this purpose, differently positioned bores can be provided in the housing 2 and the clamping holder 6, depending upon the design of the clamping holder 6. The screw heads can rest on the surface of the clamping blocks 15 or can be countersunk in the clamping blocks 15, depending upon the design of the clamping block 15. In the embodiment shown, it is provided that the clamping holder 6 have three centrifugal segments 9 and three clamping segments 11, and one fastening means 13 be provided for fastening each of the segments 9, 11. This means that each segment 9, 11 is fastened in particular to the housing 2.

[0032] In the example shown, the clamping blocks 15 are designed to be rectangular, and lie with their longitudinal axis so as to be coaxial to the longitudinal axis of the housing 2. Two through-holes 16 are arranged along the longitudinal axis of each clamping block 15, and two screws 14 project through them. A greater or lesser number of screws 14 can be used, depending upon the type of rotor or the targeted rotational speed. Clamping blocks with only one bore are also possible. In the example shown, six clamping blocks 15 are arranged on the outer lateral surface 12 of the housing 2, wherein a greater or lesser number of clamping blocks 15 may be possible, depending upon the clamping holder. To fasten the centrifugal segments 9 and/or clamping segments 11 to the housing 2, screws 14 of different lengths can be used. In the embodiment shown, for example, the centrifugal segments 9 are fastened by means of longer screws 14 than the clamping segments 11. However, this can vary, depending upon the design of the clamping holder 6.

[0033] The clamping blocks 15 lie with their base surface 17 on the outer lateral surface 12 of the housing 2, and at least one recess 18 is provided in the base surface 17, as shown in FIG. 3. Depending upon the configuration of the clamping blocks 15, i.e., depending upon how many through-holes 16 a clamping block 15 has, it may be possible for only one recess 18 to be present in the base surface 17. It is preferred that the base surface 17 have a recess 18 in the region in which the through-hole 16 opens, such that a gap is present between the through-hole 16 and the outer lateral surface 12. The recess 18 of a clamping block 15 can extend in the direction of its longitudinal axis over its entire base surface 17, wherein the width of the recess 18 corresponds at least to the diameter of the through-hole 16. The recesses 18 advantageously have a constant height and/or depth.

[0034] In order to fix the clamping holder 6 in the component 1, the screws 14 are screwed through the clamping blocks 15 into the clamping holder 6 received in the housing 2, and accordingly press the clamping blocks 15 against the outer lateral surface 12 of the housing 2. Because the base surface 17 of the clamping blocks 15 is in particular recessed in the middle, two linear contacts arise between the clamping block 15 and the outer lateral surface 12, such that the clamping block 15 rests on the outer lateral surface 12 of the housing 2 only in some regions. The clamping block 15 therefore lies against the outer lateral surface 12 along the edges, but not in the region of the through-hole 16. As a result, the cup-shaped housing 2 is not forced into deformation, which would otherwise exert constraining forces on the clamping holder 6 and would reduce the concentricity precision of the clamping holder 6. In addition, the component 1, together with the clamping holder 6, has a high area moment of inertia in all spatial directions, and thus ensures high rigidity and consequently a defined position of the clamping holder 6.

[0035] Further advantages of the invention are, inter alia, that a high torsional stiffness is achieved by the geometry of the component 1, even though the component 1 also has a radial flexibility due to its thin-walled design which does not adversely affect the clamping holder 6, but, rather, permits certain radial movements of the clamping holder 8. As a result, the effect of the centrifugal forces on the clamping holder 8 is not adversely affected, and the rotor and/or rotor journal is reliably clamped.

[0036] Although the component 1 according to the invention is radially resilient, a clamping holder 6 can be rigidly connected by the fastening means 13 according to the invention in all required spatial/angular directions.

[0037] Specifically, it has been shown that the component 1 advantageously enables the following movements of the clamping holder 8: [0038] The centers of gravity of the centrifugal segments 9 are pushed outwards by centrifugal force, as a result of which the clamping force is increased with increasing rotational speed. [0039] For unclamping, the component 1 and consequently the clamping holder 8 can be deformed by an external force, such that the internal clamping is released, and the clamped rotor can be removed. [0040] After the clamping process, the component 1 can again deform back into its original shape and can have high concentricity.