WO2002012743A1

WO2002012743A1 - Conical clamping assembly

Info

Publication number: WO2002012743A1
Application number: PCT/EP2001/006026
Authority: WO
Inventors: Zlatko Dizdarevic
Original assignee: Bikon-Technik Gmbh
Priority date: 2000-08-03
Filing date: 2001-05-26
Publication date: 2002-02-14
Also published as: JP2004506150A; CA2414956A1; AU2001272425A1; DE20013349U1

Abstract

A conical clamping assembly (10) is used for connecting a shaft (3) to a hub (1) and is located in the radial intermediate space between the outer peripheral surface (4) of the shaft (3) and the inner peripheral surface (2) of the hub (1). The conical clamping assembly comprises a main conical ring (5) with a cylindrical peripheral surface (6) and at least one conical peripheral surface (9, 11) coaxial thereto, as well as at least two other conical rings (12,13), each with a cylindrical peripheral surface (14,15) which rests against said cylindrical peripheral surface (4,2), and each with a conical peripheral surface (16,17) which rests against said conical peripheral surface (9,11) of the main conical ring (5) with the same conical angle and a corresponding diameter. The conical clamping assembly also comprises axially parallel clamping screws (18, 18) which are distributed over the periphery and by which means the conical rings (12,13) can be axially drawn onto the conical surfaces (9,11) of the main conical ring (5) by sliding down over the conical surfaces, their radial expansion causing the conical rings (5,12,13) to jam on the cylindrical peripheral surfaces (2,4). The conical ring with the higher load resulting from the compressive strains brought about during clamping has a higher apparent yield point of its material than the other.

Description

Taper clamping unit

The invention relates to a cone clamping set of the type corresponding to the preamble of claim 1.

Such cone clamping sets are known in different versions. An example is the subject of US Pat. No. 3,958,888. This is a so-called double-cone clamping set, in which the main cone ring is designed as a double-cone ring, the wall thickness of which is greatest in the middle and which has two cone surfaces extending from the center in such a way that the wall thicknesses decrease axially outwards. A conical ring is arranged on each of the two conical surfaces. The bracing is carried out by means of axial head clamping screws screwed in from one side, which pull the conical rings axially against each other.

Another example results from EP143 999 A1. Here, the main cone ring is designed as a simple cone ring with a cylindrical inner circumferential surface and a cone circumferential surface, on which two cone rings are arranged one behind the other. The clamping screws extend through a radial flange arranged at the thick-walled end of the main conical ring, partly in the conical ring adjacent to the radial flange and partly in the outer conical ring.

When tightening the tensioning screws, the cone rings can experience different loads. In the case of the aforementioned double cone clamping set, the cone ring adjacent to the screw heads is subjected to a higher load when the clamping screws are tightened due to the frictional conditions.

In the case of the main cone ring designed as a simple cone ring, the Radial flange adjacent cone ring generate higher radial clamping forces due to the greater wall thickness of the main cone ring there in order to provide sufficient surface pressure on the shaft. This cone ring therefore receives more or stronger tensioning screws and is therefore more heavily loaded.

It often happens that when the tensioning screws are tightened, and especially when the bending circumferential stress is superimposed, the cone ring begins to deform plastically with the higher load when the yield point is exceeded. This can reduce the transmissible torque. A permanently deformed cone ring is also more difficult to dismantle because it is deformed and warped.

The invention has for its object to avoid plastic deformation of the cone rings loaded more heavily in generic clamping sets.

This object is achieved by the invention reproduced in claim 1.

The cone rings are thus provided with different yield strengths, the cone ring with the higher load receiving the higher yield strength. This prevents premature plastic yielding of the higher loaded cone ring.

In the embodiment according to claim 2, the higher yield strength is produced by tempering the appropriately selected steel, both cone rings per se being able to consist of the same steel.

According to claim 3, a higher yield strength can also be provided by appropriate choice of material for the cone ring in question, so that the cone rings are made of different steels. Exemplary embodiments of the invention are shown in the drawing.

1 is a partial longitudinal section through a clamping arrangement provided with a clamping set designed as a double-cone clamping set;

Fig. 2 is a view of the left cone ring in Fig. 1 along the line

INI in Fig. 1;

Fig. 3 is a view of the right cone ring in Fig. 1 along the line III-III in Fig. 1;

Fig. 4 is a longitudinal section of another through the axis

embodiment;

Fig. 5 is a view of the left cone ring in Fig. 4 along the line

V-V in Fig. 4;

FIG. 6 is a view of the right cone ring in FIG. 4 along the line VI-VI in FIG. 4.

In the embodiment of FIG. 1, an outer component 1 in the form of a hub with a recess 42 with a cylindrical inner peripheral surface 2 is provided. Arranged in the recess 42 is an inner component 3 in the form of a shaft, the cylindrical outer peripheral surface 4 of which is concentric with the axis A and has a smaller diameter than the inner peripheral surface 2. In the radial space between the circumferential surfaces 2 and 4, a cone clamping set, designated as a whole as 10, is provided, which consists of three individual cone rings. The main ring 5 has a cylindrical outer peripheral surface 6 which bears against the inner peripheral surface 2 from the inside. In the middle - seen axially - the main conical ring 5 has a radially inwardly projecting centering web 7, which with its cylindrical inner circumferential surface 8 on the outer circumferential surface 4 of the inner component 3 (shaft) abuts. In its radially outer region, conical surfaces 9 and 11, which form inner circumferential surfaces, extend from the centering web 7 and are arranged in such a way that the greatest wall thickness is in the middle. The conical surfaces 9, 11 are concentric to the axis A and generally have an im

Self-locking area, i.e. less than 7 °, cone angle.

The main cone ring 5, which forms a so-called double cone ring, interacts with two further, simple cone rings 12, 13, each of which has an inner cylindrical circumferential surface 14, 15, which bear against the outer circumferential surface 4 of the inner component 3. The outer circumferential surfaces 16, 17 of the cone rings 12, 13 are designed as cone surfaces which have the same cone angle as the cone surfaces 9, 11 and are selected in diameter such that the cone surfaces 9 and 16 or 11 and 17 abut one another.

The cone rings 12, 13 and the centering web 7 have aligned bores into which clamping screws 18 parallel to the axis A are screwed, of which there are several distributed over the circumference. The tensioning screws 18 have heads 19 which are located to the left of the conical ring 12 and rest on the end face thereof. They pass through through bores 20 and 21 in the cone ring 12 and the centering web 7 and engage with their thread in threaded bores 22 of the cone ring 13. When the tensioning screws are tightened, the conical rings 12, 13 are moved towards one another and thereby clamp the outer component 1 and the inner component 2 against one another due to their radial expansion.

In the cone ring 12 and the centering web 7, loosening threads 23 and 24 are provided, which correspond to bore-free points in the centering web 7 and the cone ring 13 and with which the cone ring 12 can be pressed off by the main cone ring 5 and the cone ring 13 by the main cone ring 5 , As can be seen from FIGS. 2 and 3, in the exemplary embodiment eleven clamping screws distributed over the circumference are provided with the corresponding threaded bores 22 in the conical ring 13. In addition there are five jack screws with the threaded bores 23 and five further through bores 24 'so that in the cone ring 12, which gives access to the

Allow forcing threads 24.

The cone ring 12 on the left in FIG. 1 is subjected to a greater load when the clamping screws 18 are tightened. In order to avoid plastic deformations, in particular in the case of superimposed bending circumferential stress, the cone ring 12 has an increased yield strength compared to the cone ring 13, which was achieved in that the tempering steel, which is inherently the same for the cone rings 12 and 13, is tempered by a yield strength of 12 for the cone ring 12 For example, 700 N / mm ^{2 has been brought} to a yield point of 900 N / mm ² , while the ring 13 has remained unrefined. The same effect can be achieved by choosing a different steel for the cone ring 12 than for the cone ring 13 and this steel inherently has a higher yield strength than the steel of the cone ring 13.

As far as functionally corresponding parts occur in the embodiment of FIGS. 4 to 6, the reference numbers are the same. Here, too, a clamping set 30 is arranged between the peripheral surfaces 2, 4 of the outer component 1 or of the inner component 3. The tensioning set 30 comprises a main cone ring 25 with a radially projecting circumferential web 26, a cylindrical inner circumferential surface 27, which rests on the outer circumferential surface 4, and a single conical surface 28 forming an outer circumferential surface, which can be slotted at some points in a plane passing through the axis A what is to be indicated by the missing hatching. The wall thickness of the main cone ring 25 increases towards the circumferential web 26. Arranged on the conical surface 28 are two conical rings 32, 33 adjacent in the axial direction, the inner circumferential surfaces 34, 35 of which are designed as conical surfaces of the same cone angle and essentially the same diameter that interact with the conical surface 28. The outer peripheral surfaces 39.40 the cone rings 32, 33 are cylindrical and bear against the inner peripheral surface 2 of the outer component 1.

The clamping screws 18 pass through through holes 29 in the circumferential web 26 and 31 in the conical ring 32 and engage in aligned

Threaded bores 36 in the conical ring 33. When the tensioning screws 18 are tightened, the cone ring 33 is thus tightened against the circumferential web 26 and thus braced.

Shorter but stronger clamping screws 18 'are provided for the cone ring 32, which pass through holes 29' in the circumferential web 26 and engage in threaded holes 37 in the cone ring 32. Because the cone ring 32, due to the greater wall thickness of the main cone ring 25 in its area, has to exert greater radial forces if, on the inner circumferential surface 27, as desired, there should be somewhat uniform surface pressures due to the axial extension of the clamping set 30, it is subjected to greater loads in the operating state , In order to avoid plastic deformation, the cone ring 32 seated on the thick-walled end of the main cone ring 25 has a higher yield strength than the cone ring 33, which can be realized in the same way as with the cone rings 12, 13

1 to 3 are described.

5 and 6 that seven clamping screws 18 engage in the corresponding threaded bores in the conical ring 33. Through holes 31 are located at the corresponding points on the cone ring 32. There are also seven clamping screws 18 'for the cone ring 32.

Claims

PATENT CLAIMS

1. cone clamping set for connecting an inner component (3) with a cylindrical outer circumferential surface (4), in particular a shaft, with an outer component (1), in particular a hub, which has a recess with a cylindrical inner circumferential surface (2), in particular a hub, which is located in the radial space between the outer peripheral surface (4) and the

Inner circumferential surface (2) is arranged, with a main conical ring (5,25) with a cylindrical circumferential surface (6,27) and at least one conical circumferential surface (16,17; 28) coaxial therewith, with at least two further conical rings (12,13; 32,33) each with a cylindrical peripheral surface (14,15; 39,40), which bears against the cylindrical peripheral surface (4; 2), and each with a conical peripheral surface (16,17; 34,35), which on the conical The circumferential surface (9, 11; 28) of the main cone ring (5, 25) is of the same cone angle and corresponding diameter, with axially parallel clamping screws (18, 18 ') distributed over the circumference and having a head (19), at least some of which are with their Threads engage in threaded bores (22, 36) of the cone ring (13, 33) facing away from the head (19) of the screws (18, 18 ') and by means of which the cone rings (12, 13; 32, 33) slide onto the cone surfaces the conical surfaces (9, 11; 28) of the main conical ring (5.25) can be pulled open axially, whereby they are radial expand and cause the conical rings (5, 12, 13; 25, 32, 33) to jam on the cylindrical peripheral surfaces (2, 4), characterized in that the cone ring with the higher load resulting from compressive stresses occurring during tensioning has a higher yield strength of its material than the other cone ring.

2. cone clamping set according to claim 1, characterized in that the cone rings (12,13; 32,33) consist of the same steel, the cone ring (12,32) is tempered with the higher load to a higher yield point.

3. cone clamping set according to claim 1 or 2, characterized in that the cone rings (12,13; 32,33) consist of different steels and the cone ring (12,13) with the higher load is made of a steel with a higher yield strength.