DE-102024133013-A1 - Method for mounting a rolling bearing arrangement of a shaft in a housing comprising a bearing seat and a pump device comprising a rolling bearing arrangement mounted in this manner

Abstract

The invention relates to a method for mounting a rolling bearing arrangement (1) of a shaft (2) in a bearing seat (20) for the rolling bearing arrangement (1), e.g. of a housing (21) comprising at least the following steps: a) Arranging at least two rolling bearings (3A, 3B) on the shaft (2); b) Thermal expansion of the bearing seat (20) by heating at least the bearing seat (20), e.g. the housing (21) to a diameter (D LS ) that is larger than the outer diameter (D AR ) of the outer rings (6A, 6B) of the rolling bearings (3A, 3B); c) Inserting the outer rings (6A, 6B) into the thermally expanded bearing seat (20); d) Axial preloading of the outer rings (6A, 6B) of the rolling bearings (3A, 3B) relative to each other towards or away from each other at least during a period of time following step a) in which the outer diameter (D AR ) of the outer rings (6A, 6B) of the rolling bearings (3A, 3B) is less than or equal to the diameter (D LS ) of the bearing seat (20); e) Cooling the bearing seat (20) to form a transverse press fit between the outer rings (6A, 6B) of the rolling bearings (3A, 3B) and the bearing seat (20), whereby the axially preloaded state of the rolling bearings (3A, 3B) relative to each other is fixed. In the second aspect, the invention relates to a pumping device which has a rolling bearing arrangement that was assembled according to the inventive method.

Inventors

• Conrad Nickel
• Luis Herrling
• Heidemarie Weinert

Assignees

• NIDEC GPM GMBH

Dates

Publication Date

20260513

Application Date

20241112

Claims (9)

1. Method for mounting a rolling bearing arrangement (1) of a shaft (2) in a bearing seat (20) for the rolling bearing arrangement (1), for example a housing (21), comprising at least the following steps: a) Arranging at least two rolling bearings (3A, 3B) on the shaft (2); b) Thermally expanding the bearing seat (20) by heating at least the bearing seat (20) of the housing (21) to an inner diameter (D _LS ) that is larger than the outer diameter (D_AR) of the outer rings (6A, 6B) of the rolling bearings (3A, 3B); c) Inserting the outer rings (6A, 6B) into the thermally expanded bearing seat (20); d) Axial preloading of the outer rings (6A, 6B) of the rolling bearings (3A, 3B) relative to each other in a longitudinal direction (L) of the shaft (2) viewed towards or away from each other at least during a period of time following step a), in which the outer diameter (D AR ) of the outer rings (6A, 6B) of the rolling bearings (3A, 3B) is less than or equal to the inner diameter (D LS ) of the bearing seat (20); e) Cooling at least of the bearing seat (20) to form a transverse press fit between the outer rings (6A, 6B) of the rolling bearings (3A, 3B) and the bearing seat (20), whereby the axially preloaded state of the rolling bearings (3A, 3B) relative to each other is fixed.
2. Procedure according to Claim 1 , characterized in that a temperature (T mont ) to which the bearing seat (20) is heated for thermal expansion is greater than a maximum occurring operating temperature (T B ) of the rolling bearing arrangement (1) and the bearing seat (20).
3. Procedure according to Claim 1 or 2 , characterized in that the axial preloading of the outer rings (6A, 6B) to each other is effected by means of a compression spring element (9), e.g. a wave spring ring, a disc spring or an elastically deformable polymer element, between the outer rings (6A, 6B).
4. Method according to one of the preceding claims, characterized in that the axial preloading of the outer rings (6A, 6B) relative to each other is effected by means of a magnet (40) which acts on the outer rings (6A, 6B) at least until a sufficiently firm transverse press fit is formed between the outer rings (6A, 6B) and the bearing seat (20).
5. Method according to one of the preceding claims, characterized in that for axial preload the outer rings (6A, 6B) are springily or magnetically preloaded towards or away from each other.
6. Method according to one of the preceding claims, characterized in that the shaft (2) itself has raceways for rolling elements (5) and thus forms an inner ring (4A, 4B) of the rolling bearings (3A, 3B).
7. Method according to one of the preceding claims, characterized in that deep groove ball bearings, shoulder ball bearings, angular contact ball bearings or tapered roller bearings are used as rolling bearings (3A, 3B).
8. Method according to one of the preceding claims, characterized in that the rolling bearing arrangement (1) is formed from at least two rolling bearings (3A, 3B) of the same design or from at least two rolling bearings (3A, 3B) of different designs.
9. Pump device which has at least one shaft (2) rotatably mounted with respect to a housing (21), wherein a rolling bearing arrangement (1) of the shaft (2) is arranged according to a method according to one of the Claims 1 until 8 is mounted.

Description

The invention relates to a method for mounting a rolling bearing arrangement of a shaft in a housing having a bearing seat and, in a second aspect, a rolling bearing arrangement mounted in this way having a pump device. Typically, rotor shafts of electric motors in pumping devices are supported by plain or rolling bearings. Compact bearings are a well-known type of rolling bearing, which integrates multiple rolling bearings into a single, structurally defined bearing unit, thus providing a mechanically defined support structure. While such compact bearings have proven effective, even minor changes to the bearing geometry necessitate relatively costly modifications to the compact bearing. This is particularly true when a large number of different pumping devices, such as a pumping platform with slightly varying bearing seat geometries, need to be specifically adapted to customer requirements. In such cases, adapting a compact bearing is often expensive and uneconomical. Furthermore, the demands for the quietest possible operation are constantly increasing, particularly in fluid pumps, and these demands are difficult or impossible to achieve with rolling bearing arrangements based on current design principles. Additionally, the pump efficiency of a pumping device is reduced if the pump shaft, which carries the impeller, has an undefined preload with slight play. Such play increases the required clearance of the pump rotor within the pump housing, which is undesirable. Fluid pumps are manufactured in large quantities, making simplified assembly, especially tolerance-independent assembly, desirable. Moreover, the need to further increase or optimize the use of common parts and the standardization of bearing systems is growing. This can also lead to desirable supplier independence by enabling the selection of standard components. The object of the invention is therefore to provide a method for assembling a rolling bearing arrangement that can address and solve the aforementioned increasing requirements. Furthermore, it is an object of the invention to provide a method for assembling a rolling bearing arrangement that can overcome, or at least reduce, the disadvantages of the prior art. In particular, quiet operation of the bearing and a defined bearing condition, especially a defined bearing preload condition, should be achieved. These problems are solved by a method for mounting a rolling bearing arrangement of a shaft in a housing comprising a bearing seat for the rolling bearing arrangement with the features of claim 1. Furthermore, the problem is solved by a pumping device with the features of claim 9. An inventive method for mounting a rolling bearing arrangement of a shaft in a bearing seat for the rolling bearing arrangement, e.g. of a housing, comprises at least the following steps: a) Arranging at least two rolling bearings on the shaft; b) Thermal expansion of the bearing seat by heating at least the bearing seat, e.g. the housing, to a diameter (D LS ) that is larger than the outer diameter (D AR ) of the outer rings of the rolling bearings; c) Inserting the outer rings into the thermally expanded bearing seat; d) Axial preloading of the outer rings of the rolling bearings relative to each other in a longitudinal direction of the shaft, viewed towards each other or away from each other, at least during a period of time following step a), in which the outer diameter (D AR ) of the outer rings of the rolling bearings is less than or equal to the diameter (D LS ) of the bearing seat; e) Cooling the bearing seat to form a transverse press fit between the outer rings of the rolling bearings and the bearing seat, whereby the axially preloaded state of the rolling bearings relative to each other is fixed. The method according to the invention makes it possible to create a preload state by means of simple assembly steps, in particular avoiding considerable assembly forces and adjustment work, which remains defined after assembly and does not change during operation of the bearing or only to an acceptable extent, i.e. insignificantly. The insertion of the bearing into a thermally expanded bearing seat, which has a larger bearing seat diameter than the diameter of the outer rings of the rolling bearings, allows for virtually effortless insertion of the bearing-carrying shaft into the bearing seat. The preloaded bearing condition is secured by a transverse press fit, which forms when a thermally expanded bearing seat, through cooling, conforms to the outer rings of the rolling bearings and the clearance fit transitions into an interference fit (transverse press fit) during assembly. In this pressed-in state, the outer rings of the bearings can no longer move relative to each other, thus ensuring the The preload achieved during assembly is maintained. Preloading devices, such as spring washers or the like, which may be used to create the preload before assembly, can remain in the bearing after the cross-fit conne