DE102018109190A1 - Shaft-hub-connection - Google Patents

Abstract

The invention relates to a shaft-hub joint comprising at least one shaft having an outer peripheral surface and a hub having an inner peripheral surface, the hub having the inner peripheral surface disposed on an axially-extending portion of the outer peripheral surface of the shaft; wherein the hub is part of a rolling bearing; wherein at least the portion of the outer peripheral surface is conical.

Description

The invention relates to a shaft-hub joint comprising at least one shaft having an outer peripheral surface and a hub having an inner peripheral surface, the hub having the inner peripheral surface disposed on an axially-extending portion of the outer peripheral surface of the shaft; wherein the hub is part of a rolling bearing. In particular, the rolling bearing is a floating bearing. A floating bearing transmits in particular no or only very small forces in the axial direction. Usually, only a slight press fit between the hub and shaft is required (ie, a slight excess of an outer diameter of the shaft relative to the bore of the shaft) to ensure a secure fit of the hub on the shaft and to prevent displacement of the hub on the shaft.

Due to stresses in the operation of a shaft-hub connection can, for. B. by bending the shaft, acting in the axial direction forces that can lead to a displacement of the movable bearing on the shaft.

It is known that provided for such cases stronger press-fits between hub and shaft or circlips or lock nuts are used. Stronger press fits, however, are not always possible due to the resulting higher load on the shaft or hub. Circlips or lock nuts increase the space required or increase the cost of manufacturing and assembly. In addition, a groove is required for the arrangement of a locking ring, which reduces the strength of the hub or the shaft.

The object of the invention is to provide a shaft-hub connection that can prevent displacement of a floating bearing on the shaft. The shaft-hub connection should be inexpensive to produce and assemble.

This object is achieved with a shaft-hub connection according to the features of the independent claim. Further advantageous embodiments of the invention are specified in the dependent formulated claims. The individually listed in the dependent formulated features can be combined in a technologically meaningful way and can define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

It is proposed a shaft-hub connection, at least comprising a shaft having an outer peripheral surface and a hub having an inner peripheral surface. The hub is disposed with the inner peripheral surface on an axially-extending portion of the outer peripheral surface of the shaft; wherein the hub is part of a rolling bearing. At least the portion of the outer peripheral surface is conical.

In particular, the rolling bearing comprises an inner bearing ring, an outer bearing ring and arranged therebetween rolling elements, which are optionally held by a cage in position to each other.

In particular, the portion extends from a first end to a second end along the axial direction; wherein at the first end a stop is provided which limits a displacement of the hub along the axial direction. A first diameter of the shaft at the first end is smaller than a second diameter at the second end.

Preferably, the inner circumferential surface is cylindrical.

According to another embodiment, the inner peripheral surface is conical.

In particular, a conicity of the portion and the inner circumferential surface is directed substantially the same. Here, the same direction means that a diameter of the inner peripheral surface and the portion along the same axial direction in the radial direction increase together or decrease in size.

Preferably, a smallest (inner) diameter of the hub is smaller than the second diameter; wherein the hub is slidable over the second end of the shaft and to the stop, wherein at least an elastic deformation of at least the hub is required.

In particular, a smallest (inner) diameter of the hub is larger than the first diameter.

When assembling the hub onto the shaft, the hub is slid over the second end of the section onto the shaft. The second end of the shaft and / or the inner peripheral surface of the hub are at least temporarily at least elastically deformed (possibly to a lesser extent plastic) so that the hub is pushed over the second end of the section and then shifted so far in the axial direction until the hub contacts the stopper.

In particular, a largest (inner) diameter of the hub is smaller than the second diameter.

In this case, the smallest and the largest diameter of the hub are arranged so that they contact the outer peripheral surface in the region of the section in the operation of the shaft-hub connection.

In particular, the second diameter is at most 1%, preferably at most 0.1% larger than the first diameter. Preferably, the second diameter is at least 0.01%, preferably at least 0.05% larger than the first diameter.

Preferably, the rolling bearing is a floating bearing.

In particular, the hub is an inner bearing ring of the rolling bearing, which contacts a plurality of rolling elements of the rolling bearing.

By way of precaution, it should be noted that the numerical terms used here ("first", "second",...) Primarily (only) serve to distinguish a plurality of similar objects, variables or processes, ie in particular no dependence and / or order of these objects, quantities or mandate processes to one another. If a dependency and / or order are required, this is explicitly stated here or it obviously results for the person skilled in the art when studying the concretely described embodiment.

• 1: eine Welle-Nabe-Verbindung in einer Seitenansicht im Schnitt;
• 2: einen Teil der Welle-Nabe-Verbindung nach 1; mit der Welle-Nabe-Verbindung in einer ersten Ausführungsvariante; und
• 3: einen Teil der Welle-Nabe-Verbindung nach 1; mit der Welle-Nabe-Verbindung in einer zweiten Ausführungsvariante.

The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the invention should not be limited by the embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and / or figures. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. The same reference numerals designate the same objects, so that explanations of other figures can be used if necessary. Show it:

• 1 : a shaft-hub connection in a side view in section;
• 2 : a part of the shaft-hub connection behind 1 ; with the shaft-hub connection in a first embodiment; and
• 3 : a part of the shaft-hub connection behind 1 ; with the shaft-hub connection in a second embodiment.

The 1 shows a shaft-hub connection 1 in a side view in section. The shaft-hub connection 1 (here on a CVT transmission, continous variable transmission), includes a shaft 2 with an outer peripheral surface 3 and a hub 4 with an inner peripheral surface 5 , The hub 4 is with the inner peripheral surface 5 on a in an axial direction 6 extending section 7 the outer peripheral surface 3 the wave 2 arranged; being the hub 4 Part of a rolling bearing 8th is. The rolling bearing comprises an inner bearing ring 15 , an outer bearing ring and arranged therebetween rolling elements 16 , The section 7 extends from a first end 9 to a second end 10 along the axial direction 6 ; being at the first end 9 an attack 11 is provided, which is a displacement of the hub 4 along the axial direction 6 limited. A first diameter 12 the wave 2 at the first end 9 is smaller than a second diameter 13 at the second end 10 ,

2 shows part of the shaft-hub connection 1 to 1 ; with the shaft-hub connection 1 in a first embodiment. On the comments too 1 is referred to. Here are the outer peripheral surface 3 and the section 7 the outer peripheral surface 3 tapered. In addition, the inner peripheral surface 5 the hub 4 tapered.

The conicity of the section 7 and the inner peripheral surface 5 are essentially the same. Directly aligned here means that a diameter of the inner peripheral surface 5 and the section 7 along the same axial direction 6 in the radial direction 19 zoom in together or downsize together. It can be seen that the outer peripheral surface 3 and the inner peripheral surface 5 extend substantially parallel to each other.

A first diameter 12 the wave 2 at the first end 9 is smaller than a second diameter 13 at the second end 10 , Visible is a smallest (inner) diameter 14 the hub 4 smaller than the second diameter 13 , The hub 4 is about the second end 10 on the wave 2 and until it stops 11 pushed, in which case an at least elastic deformation of at least the hub 4 is required.

When mounting the hub 4 on the wave 2 becomes the hub 4 over the second end 10 of the section 7 on the wave 2 postponed. This will be the second end 10 the wave 2 and / or the inner circumferential surface 5 the hub 4 at least temporarily at least elastically deformed (possibly to a lesser extent plastic) so that the hub 4 over the second end 10 of the section 7 pushed and then so far in the axial direction 6 is shifted until the hub 4 the stop 11 contacted.

Visible are the smallest diameter 14 and the largest diameter of the hub 4 arranged so that they are the outer peripheral surface 3 in the area of the section 7 during operation of the shaft-hub connection 1 to contact. The section 7 is here in particular by the stop 11 and through the end of the hub 4 educated.

3 shows part of the shaft-hub connection 1 to 1 ; with the shaft-hub connection 1 in a second embodiment. On the comments too 1 is referred to. Here are the outer peripheral surface 3 and the section 7 the outer peripheral surface 3 tapered. The inner peripheral surface 5 the hub 4 cylindrical.

A first diameter 12 the wave 2 at the first end 9 is smaller than a second diameter 13 at the second end 10 , Visible is a smallest (constant) (inside) diameter 14 the hub 4 smaller than the second diameter 13 or as the largest diameter of the shaft 2 in the area over which the hub 4 on the section 7 is postponed. The hub 4 is about the second end 10 on the wave 2 and until it stops 11 pushed, in which case an at least elastic deformation of at least the hub 4 is required.

When mounting the hub 4 on the wave 2 becomes the hub 4 over the second end 10 of the section 7 on the wave 2 postponed. This will be the second end 10 the wave 2 and / or the inner circumferential surface 5 the hub 4 at least temporarily at least elastically deformed (possibly to a lesser extent plastic) so that the hub 4 over the second end 10 of the section 7 pushed and then so far in the axial direction 6 is shifted until the hub 4 the stop 11 contacted.

Here is a largest (constant) (inside) diameter of the hub 4 smaller than the second diameter 13 or as the largest diameter of the shaft 2 in the area over which the hub 4 on the section 7 is postponed.

The conicity of the outer peripheral surface 3 the wave 2 prevents a hike of the hub 4 along the axial direction 6 , On the one hand, the hub contacted 4 the stop 11 , On the other side, the hub contacts 4 the conical section 7 the wave 2 , so that also a shift in this axial direction 6 can be prevented.

LIST OF REFERENCE NUMBERS

1

Shaft-hub-connection

2

wave

3

outer peripheral surface

4

hub

5

inner peripheral surface

6

axial direction

7

section

8th

roller bearing

9

first end

10

second end

11

attack

12

first diameter

13

second diameter

14

smallest diameter

15

inner bearing ring

16

rolling elements

17

axis of rotation

18

circumferentially

19

radial direction

Claims (10)

Shaft-hub connection (1), comprising at least one shaft (2) with an outer peripheral surface (3) and a hub (4) with an inner circumferential surface (5), wherein the hub (4) with the inner circumferential surface (5) in a section (7) extending in an axial direction (6) of the outer peripheral surface (3) of the shaft (2); the hub (4) being part of a rolling bearing (8); wherein at least the portion (7) of the outer peripheral surface (3) is conical. Shaft-hub connection (1) to Claim 1 wherein the portion (7) extends from a first end (9) to a second end (10) along the axial direction (6); wherein at the first end (9) a stop (11) is provided which limits a displacement of the hub (4) along the axial direction (6), wherein a first diameter (12) of the shaft (2) at the first end (9 ) is smaller than a second diameter (13) at the second end (10). Shaft-hub connection (1) according to one of the preceding claims, wherein the inner peripheral surface (5) is cylindrical. Shaft-hub connection (1) according to one of the preceding Claims 1 and 2 , wherein the inner peripheral surface (5) is conical. Shaft-hub connection (1) to Claim 4 wherein a taper of the portion (7) and the inner peripheral surface (5) is directed substantially the same. Shaft-hub connection (1) according to one of the preceding Claims 2 to 5 wherein a smallest diameter (14) of the hub (4) is smaller than the second diameter (13); wherein the hub (4) via the second end (10) on the shaft (2) and up to the stop (11) can be pushed, wherein at least an elastic deformation of at least the hub (4) is required. Shaft-hub connection (1) according to one of the preceding Claims 2 to 5 wherein a smallest diameter (14) of the hub (4) is larger than the first diameter (12). Shaft-hub connection (1) according to one of the preceding Claims 2 to 7 wherein the second diameter (13) is at most 1% larger than the first diameter (12). Shaft-hub connection (1) according to one of the preceding claims, wherein the rolling bearing (8) is a floating bearing. Shaft-hub connection (1) according to one of the preceding claims, wherein the hub (4) is an inner bearing ring (15) of the rolling bearing (8) which contacts a plurality of rolling elements (16) of the rolling bearing (8).

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