DE102008025352A1 - Bearing set for an axial and radial shaft to be guided - Google Patents

Abstract

Bearing set (1) for an axially and radially leading shaft, an impeller or the like, consisting of an operational axial forces receiving ball bearing (5, 6, 7, 8) and an occurring back pressure forces, designed as a support bearing cylindrical roller bearing (2, 3, 4th , 8), wherein the cylindrical roller bearing (2, 3, 4, 8) on the ordseite on the inner and outer ring (2, 8) is shortened, the outer or inner ring (2, 8) on the ball bearing ( 5, 6, 7, 8) facing away from a conventional radial inrun (9), and the cylindrical rollers (3) when a back pressure force on the end face (10) of the outer and / or inner ring (5, 8) of the ball bearing (5, 6, 7, 8) and the stop board (9) of the cylindrical roller bearing (2, 3, 4, 8) abut.

Description

Field of the invention

The The invention relates to a bearing set for an axial and radially to be guided shaft, an impeller or the like, consisting of an operational axial forces receiving Ball bearing and an occurring back pressure forces receiving, designed as a support bearing cylindrical roller bearing.

Background of the invention

In all areas of mechanical engineering, where an impeller, such as a Fan wheel, or similar to the Surrounding structure must be axially very tight, especially in the storage of axially very accurate leading Shafts, such as gear shafts or rotary blowers, Bearing sets from several types of bearings are used. Especially in applications with a directional axial force during operation and in which only in special operating conditions, with temporal low share, for example, when raising and lowering a Plant, axial force lower than the axial operating pressure Back pressure force, no full and expensive axial back pressure bearing can be used.

For these applications, according to the DE 10 2005 054 705 A1 a bearing set for an axially tight and accurate leading shaft, an impeller or the like proposed for machine units, in which an operational pressure forces receiving angular contact ball bearings and an occurring back pressure forces receiving, designed as a support bearing cylindrical roller bearings are used, wherein the cylindrical roller bearing as NJ cylindrical roller bearing with two Radial ribs on the outer ring and arranged on the side facing away from the angular contact ball bearing radial flange is formed in the ring.

A similarly constructed bearing set for the same purpose is in the DE 10 2006 033 777 A1 described. In this bearing set, the outer ring of the cylindrical roller bearing a single radial board and the inner ring also has a single radial flange, wherein the arranged between the inner ring and the outer ring set of cylindrical rollers is axially bounded by the rims of the outer ring and the inner ring.

Both Embodiments of the bearing set have proven themselves However, each consist of two in their dimensions of the standard Roller bearings.

Object of the invention

In front In this background, the invention is based on the object Bearing set for an axially leading shaft, a Impeller or the like, for example for a transmission shaft or the rotor of a screw compressor or a rotary blower to create, which requires a smaller space, thus cost is and has a reduced friction.

Summary of the invention

outgoing of this task is for a bearing set the mentioned in the opening paragraph, that according to the invention Cylindrical roller bearing on the side facing the ball bearing shortened the width on the inner and outer ring is, the outer or the inner ring on the ball bearing opposite side has a conventional radial inrun, and the cylindrical rollers when a back pressure force occurs on the front side of the outer or inner ring of the ball bearing and rest against the starting board of the cylindrical roller bearing.

The Ball bearing carries only axially in the main operating pressure direction, while the cylindrical roller bearing combined loads axial back pressure and the radial load absorbs. The Function of the axial bearing facing cylindrical roller bearing board on the outer ring, the thrust bearing takes over its front side on the inner and / or outer ring, if necessary can be adapted to an optimized board geometry. Advantageous is in particular that there is no reduction in board height There are punctures, thus exploiting the entire height of the board leaves.

According to one Embodiment, the thrust bearing of a deep groove ball bearing exist, preferably an increased radial clearance has to increase the load capacity.

According to one In another embodiment, the thrust bearing of an angular contact ball bearing which is particularly indicated when higher axial loads occur. The angular contact ball bearing can form an X or O arrangement with the NJ cylindrical roller bearing.

There the cylindrical roller bearing cage projects into the axial bearing, it is advantageous for the thrust bearing an axial one to use a small space-consuming snap cage, which is common in deep groove ball bearings.

A further cost reduction can be achieved if the inner or the outer rings of the ball bearing and the cylindrical roller bearing consist of one piece contiguous, since there can be avoided by inaccuracies of the aufaddierenden tolerances between the inner rings or the outer rings.

Advantageous is in the bearing set according to the invention, that the axial clearance can be at 0.1 mm, preferably below, and that the supernatant of the outer rings lie opposite the inner ring at ± 0.005 mm can.

Short description of the drawing

The The invention will be described below with reference to the accompanying drawings an embodiment explained in more detail. In detail, the drawing shows a sectioned side view a inventively designed bearing set.

Detailed description the drawing

The bearing set shown in the drawing 1 consists of an outer ring 2 of the cylindrical roller bearing with in a cage 4 guided cylindrical rollers 3 and an outer ring 5 of the ball bearing with in a cage 7 guided balls 6 , A one-piece inner ring 8th with raceways for the balls 6 and the roles 3 completes the bearing set 1 ,

The outer ring 2 of the cylindrical roller bearing is on the outer ring 5 the ball bearing side facing the width on the outer ring shortened while the inner ring 8th in the area of the cylindrical roller bearing outside a usual, radial inrun board 9 having.

Accordingly, the ball bearing designed as an angular contact ball bearing the large axial forces in one direction, while the cylindrical roller bearing receives a lower back pressure force this axial force by the cylindrical rollers on the one hand on the front page 10 of the outer ring 5 of the angular contact ball bearing and on the other hand at the start board 9 of the inner ring 8th Start in the area of the cylindrical roller bearing.

The bearing set can be easily adjusted so that the axial clearance is only 0.1 mm or less. Likewise, the supernatant of the outer rings needs 2 . 5 opposite the inner ring 8th only at ± 0.005 mm.

The illustrated embodiment shows a bearing set from an angular contact ball bearing 5 . 6 . 7 . 8th and a cylindrical roller bearing 2 . 3 . 4 . 9 , with undivided inner ring 8th However, the invention is based on the illustrated bearing set 1 not limited. Rather, the bearing set 1 consist of two separate bearings, a ball bearing and a cylindrical roller bearing, wherein the cylindrical roller bearing is shortened on the ball bearing side facing the width on the inner and outer ring and the outer or inner ring of the cylindrical roller bearing on the side facing away from the ball bearing a usual has radial inrun, so that the cylindrical rollers abut the occurrence of a back pressure force on the front side of the outer and / or inner ring of the ball bearing and the inrun of the cylindrical roller bearing.

Especially the ball bearing can consist of a simple deep groove ball bearing, when the operational axial forces are not too large, where the deep groove ball bearing to adapt to the operational axial forces may have an increased radial clearance. Furthermore is for the embodiment with an NJ cylindrical roller bearing and an angular contact ball bearing both the X-arrangement and the O arrangement possible. An X-arrangement or an O-arrangement is also available with an NJ cylindrical roller bearing and a deep groove ball bearing possible.

1

bearings

2

outer ring of the cylindrical roller bearing

3

cylindrical rollers

4

Cage

5

outer ring of the ball bearing

6

roll

7

Cage

8th

one-piece inner ring

9

start-up board

10

front of the outer ring

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102005054705 A1 [0003]
• DE 102006033777 A1 [0004]

Claims (8)

Bearing set ( 1 ) for an axially and radially leading shaft, an impeller or the like, consisting of an operational axial forces receiving ball bearing ( 5 . 6 . 7 . 8th ) and an occurring back pressure forces receiving, designed as a support bearing cylindrical roller bearings ( 2 . 3 . 4 . 8th ), characterized in that the cylindrical roller bearing ( 2 . 3 . 4 . 8th ) on the ball bearing ( 5 . 6 . 7 . 8th ) side facing the width on the inner and outer ring ( 2 . 8th ), the outer or inner ring ( 2 . 8th ) on the ball bearing ( 5 . 6 . 7 . 8th ) side facing away from a conventional radial inrun 9 ) and the cylindrical rollers ( 3 ) when a back pressure force occurs at the end face ( 10 ) of the outer or inner ring ( 5 . 8th ) of the ball bearing ( 5 . 6 . 7 . 8th ) and at the start board ( 9 ) of the cylindrical roller bearing ( 2 . 3 . 4 . 8th ) issue. Bearing set according to claim 1, characterized in that the thrust bearing ( 5 . 6 . 7 . 8th ) consists of a deep groove ball bearing. Bearing set according to claim 2, characterized that the deep groove ball bearing an increased radial clearance having. Bearing set according to claim 1, characterized in that the thrust bearing ( 5 . 6 . 7 . 8th ) consists of an angular contact ball bearing in X or O arrangement. Bearing set according to one of claims 1 to 4, characterized in that the cylindrical rollers ( 3 ) in a snap cage which requires a small amount of space ( 4 ) are guided. Bearing set according to one of claims 1 to 5, characterized in that the inner or the outer rings of the ball bearing ( 5 . 6 . 7 . 8th ) and the cylindrical roller bearing ( 2 . 3 . 4 . 8th ) connected in one piece ( 8th ) consist. Bearing set according to one of claims 1 to 6, characterized in that the axial clearance at 0.1 mm, preferably underneath, lies. Bearing set according to one of claims 1 to 7, characterized in that the projection size (Ü) of the outer rings ( 2 . 5 ) in relation to the inner ring ( 8th ) is ± 0.005 mm.