FRICTIONALLY LOCKING SHAFT/HUB CONNECTION

Abstract

A frictionally locking shaft/hub clamping connection (1) having at least two cone clamping rings (4, 5) which bear against one another on their cone faces (4a, 5a) and can be pushed onto one another axially by way of clamping elements (6), the radial forces which are produced bringing about a frictionally locking connection between the shaft (2) and the hub (3). The cone faces (4a, 5a) of the clamping rings (4, 5) which bear against one another have a non-round cross section which differs from the circular shape.

Claims

1. A component for a frictionally locking shaft/hub clamping connection (1), comprising: at least two cone clamping rings (4, 5) which bear against one another on cone faces (4a, 5a) thereof that are adapted to be pushed onto one another axially by way of a plurality of circumferentially distributed clamping elements (6), such that radial forces are produced to bring about a frictionally locking connection in a circumferential direction between the shaft (2) and the hub (3), and the cone faces (4a, 5a) of the clamping rings (4, 5) which bear against one another have a non-round cross section that differs from a circular shape.

2. The component as claimed in claim 1, wherein the cone faces (4a, 5a) have a mathematically constant curve progression.

3. The component as claimed in claim 1, wherein the cone faces (4a, 5a) have an oval cross section.

4. The component as claimed in claim 1, wherein the cone faces (4a, 5a) have a polygonal or cycloidal cross section.

5. The component as claimed in claim 1, wherein the cone faces (4a, 5a) have at least three projections (4a, 5a) or recesses which are distributed uniformly over circumferences thereof, correspond with one another, and are connected to one another by way of arcuate or approximately tangentially running circumferential sections (4a, 5a) which correspond with one another.

6. The component as claimed in claim 5, wherein the projections (4a, 5a) or the recesses and the approximately tangentially running circumferential sections (4a, 5a) have a diameter difference relative to one another of from approximately 5% to approximately 30%.

7. The component as claimed in claim 5, wherein the approximately tangentially running circumferential sections (4a, 5a) are longer in the circumferential direction than the projections (4a, 5a) or the recesses.

8. The component as claimed in claim 6, wherein the approximately tangentially running circumferential sections (4a, 5a) are at least 50% longer than the projections (4a, 5a) or the recesses

9. The component as claimed in claim 1, wherein the cone faces are provided with at least one of a coating which reduces a coefficient of friction or a lubricant which reduces the coefficient of friction.

10. The component as claimed in claim 1, wherein the cone clamping rings (4, 5) have bores (4b, 5b) for the clamping elements (6), said bores (4b, 5b) extend axially and are distributed over a circumference, and said bores are positioned in circumferential regions of a maximum radial wall thickness of the cone clamping rings.

11. The component as claimed in claim 1, wherein the axial clamping elements (6) are positioned offset radially with respect to a center of the approximately tangentially running circumferential sections (4a, 5a).

12. The component as claimed in claim 1, wherein the cone faces (4a, 5a) which bear against one another have a constantly changing cross-sectional profile in an axial direction, said cross-sectional profile merges from a first cone region with a circular cross section into a region of a second cone region with a non-round cross section.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Further features and advantages result from the description of one exemplary embodiment and from the drawing, in which:

[0021] FIG. 1 shows a longitudinal section through the clamping connection according to the invention in the installed state between a shaft and a hub,

[0022] FIG. 2 shows an axial plan view of an inner cone clamping ring,

[0023] FIG. 3 shows an axial plan view of an outer cone clamping ring, and

[0024] FIG. 4 shows a perspective view of the two cone clamping rings in the state in which they are not yet installed.

DETAILED DESCRIPTION

[0025] The axial section in FIG. 1 shows a releasable shaft/hub clamping connection 1 which is installed and braced between a shaft 2 and a hub 3.

[0026] The shaft/hub connection is formed of an inner cone clamping ring 4 which is seated on the shaft 2, an outer cone clamping ring 5 which carries the hub 3 on the outside, and of a plurality of axial clamping elements which are distributed over the circumference in the form of screws 6.

[0027] The cone clamping rings 4 and 5 bear against one another along the cone faces 4a and 5a, and can be displaced and braced relative to one another by way of the screws 6.

[0028] To this end, the screws 6 lie with their screw head against the end side of the inner cone clamping ring 4, pass through the latter and are screwed with their threaded shank into corresponding threaded bores of the outer cone clamping ring 5.

[0029] The two cone clamping rings 4 and 5 are pushed onto one another by way of the tightening of the screws 6. Here, the cone faces 4a and 5a which bear against one another bring about radial widening of the clamping rings, with the result that a clamping connection is produced between the shaft 2 and the hub 3.

[0030] It is essential then that, in accordance with FIGS. 2 and 3, the two cone clamping rings 4 and 5 have non-round cone faces 4a and 5a, respectively. The cone faces 4a and 5a have already been configured in a manner which corresponds to one another during the production, with the result that they come into flat contact with one another when the cone clamping rings are plugged together, and, during the tightening of the clamping screws 6, bring about not only the desired radial widening of the clamping connection radially to the inside and radially to the outside, but rather also enter into a positively locking connection.

[0031] In the exemplary embodiment, the cone faces 4a and 5a consist of approximately tangentially running circumferential sections 4a and 5a, respectively, which are connected to one another at their ends by way of arcuate sections 4a and 5a, respectively. Here, the arcuate sections 4a act as projections, and the arcuate sections 5a act as recesses.

[0032] The approximately tangential circumferential sections 4a and 5a are more than twice as long as the arcuate circumferential sections 4a and 5a, respectively.

[0033] In the exemplary embodiment, the cone faces consist in each case of six tangential and six arcuate circumferential sections. It goes without saying that it lies within the scope of the invention to decrease or to increase the number of said circumferential sections. It is merely to be ensured here that the cone faces run without abrupt changes of the contour, in particular without points or notches.

[0034] FIG. 4 shows the two clamping rings 4 and 5 and the clamping screws 6 in the state in which they are not yet mounted. Here, the clamping screws 6 cross through the inner cone clamping ring 4 on its radially projecting flange as is customary, but they are not yet screwed into the outer cone clamping ring 5.

[0035] As soon as the cone clamping rings 4 and 5 are moved together axially and are braced sufficiently by way of the clamping screws 6, they are connected to one another not only in a frictionally locking manner as previously, but rather also in a positively locking manner on account of the non-round clamping face contour.

[0036] As a result, the torque which can be transmitted is increased considerably in comparison with conventional frictionally locking shaft/hub clamping connections.

[0037] Conventional cone clamping elements are usually slotted in each case once both on the inner ring and on the outer ring, in order that the bridging of the play, for example from IT8 to IT7, takes place without an appreciable pressure loss. It is likewise possible within the context of the present invention for the cone clamping rings, that is to say the inner ring and the outer ring, to be of slotted configuration. During clamping of the cone clamping rings, a certain relative movement of the inner cone face with respect to the outer cone face in the circumferential direction takes place on account of the slotting. This leads to those contours of the corresponding cone faces of the inner cone ring and the outer cone ring which differ from the circular shape no longer fitting together in an optimum manner in the case of said relative movement. Therefore, a slight plastic deformation of the cone clamping rings can take place during clamping, which plastic deformation is accepted, however. As an alternative, it is possible for the cone clamping rings to be of non-slotted configuration. In this case, the permissible fits are to be correspondingly restricted, for example IT7 to IT6.