DE102015200299A1 - Roller Needle cross journal - Google Patents

Abstract

The invention relates to a rolling bearing with a bearing inner ring (1), a bearing outer ring (2) and arranged therebetween cylindrical rolling elements (3) running on raceways (7) of the bearing rings (1, 2), wherein the rolling elements (3) two different designs have different lengths (LZ, LN) and diameters (DZ, DN) and both types have mutually crossed axes. According to the invention, the rolling elements (3) are designed as cylindrical rollers (5) and needle rollers (6) and arranged on a circumference of the bearing inner ring (1), the needle rollers (6) projecting beyond the cylindrical rollers (5) axially on both sides.

Description

Field of the invention

The invention relates to a rolling bearing with a bearing inner ring, a bearing outer ring and arranged therebetween cylindrical rolling elements. The rolling elements run on the raceways of the bearing rings, wherein the rolling elements have two different designs with different lengths and diameters. Both designs have mutually crossed axes.

As prior art is according to the document DE 10 2006 044 802 A1 a combined roller bearing known. The combined roller bearing has an inner and an outer ring and arranged therebetween rolling elements, which are designed as rollers and balls. The rollers and balls have different diameters, with the balls rolling in the raceways and the rollers on the remaining shoulder surfaces. This should ensure a concrete separation of male radial and axial forces, the radial forces are absorbed by the rollers and the axial forces of the balls.

Other combined roller bearings are for example from the DE 4 142 433 C1 or from the DE 1 898 225 U known.

The prior art also includes the cross roller bearings, such as in the DE 1 060 135 U disclosed. The cross roller bearings consist of an outer ring, an inner ring and arranged therebetween rolling elements and plastic spacers. The cylindrical rollers are arranged crosswise and roll off in the rectangular ground raceways. The known advantages of the cross roller bearing has the disadvantage that in the case of non-aligned rolling elements high edge pressures between rollers and raceways can occur, leading to high wear.

Also part of the prior art include the spherical roller bearings with balls, for example, in the DE 102 25 572 A1 are disclosed. In this case, balls and barrel rollers are used as rolling elements. The balls have a slightly larger diameter than the rollers, wherein the balls and rollers are arranged alternately in the circumferential direction. At low loads carry only the balls and at peak loads and the rollers with the radial load.

Furthermore, include the massive needle bearings, such as DE 10 2011 078 712 A1 , also to the state of the art. The known solid needle bearings have on the inner or outer ring on two lateral shelves, where bearing needles start when shooting axial forces. A disadvantage of solid needle bearings on the one hand, the high production cost for the machining production of the lateral shelves and on the other hand, the additional space required for the shelves.

Object of the invention

The object of the invention is therefore to provide a combined radial and thrust bearing, which requires a comparatively low to the cited prior art machining manufacturing effort and ensures optimum power in the radial and axial directions.

Description of the invention

To solve the object of the invention specified in claim 1 rolling bearing is proposed. Optional advantageous embodiments of the invention arise wholly or partly from the dependent claims.

The rolling bearing according to the invention is characterized in that the rolling elements are designed as cylindrical rollers and as needle rollers and are arranged on a circumference of the bearing ring, wherein the needle rollers project beyond the cylindrical rollers on both sides. Needle rollers are understood as meaning long cylindrical rolling bodies whose length-diameter ratio is from 2.5 to 10. By the needle rollers radial and by the cylindrical rollers axial forces are absorbed.

According to an advantageous embodiment, the cylindrical rollers and the needle rollers are arranged in a common cage. Preferably, the cage is made of a metallic material. However, it would also be advantageous if the cage is made of plastic. Here are all common for the skilled metal materials and plastics conceivable.

Furthermore, it is advantageous if the cylindrical rollers are arranged perpendicular to the circumference of the bearing inner ring. After the circumference of the bearing inner ring and the circumference of the bearing outer ring are concentric, the cylindrical rollers are also perpendicular to the circumference of the bearing outer ring. This means that the central axis of each cylindrical roller intersects the axis of rotation of the rolling bearing.

According to the invention, it is likewise when at least one needle roller is arranged between two adjacent cylindrical rollers. It is thus also possible and according to the invention to arrange a group of needle rollers between two adjacent cylindrical rollers. Especially with high radial forces, it is advantageous to use needle roller groups. The It is said that a plurality of needle rollers on the circumference of the bearing inner ring in the circumferential direction, preferably at the same distance, arranged one behind the other. The number of needle rollers, which lie directly behind each other, are adapted to the radial forces to be absorbed.

According to an advantageous embodiment, the length of the cylindrical roller is at most 40% of the needle roller length. Furthermore, it is advantageous if the diameter of the needle roller is at most 60% of the cylindrical roller diameter.

In a further embodiment of the invention cylindrical rollers are arranged centrally between two end faces of the needle rollers. The cylindrical rollers can also be offset as desired from the axial center of the needle roller.

It is also expedient that a bearing ring is axially formed in two parts. Preferably, the bearing outer ring is made in one piece, while the bearing inner ring is then designed axially two-piece assembly. Alternatively, however, the bearing inner ring in one piece and the bearing outer ring may be formed in two parts.

Brief description of the drawings

Further details, features, combinations of features and effects on the basis of the invention will become apparent from the following description of preferred exemplary embodiments of the invention and from the drawings. These show in:

1 An embodiment of an inventively embodied rolling bearing with individual needle rollers,

2 a cross section through an exemplary embodiment of an inventively designed roller bearing,

3 a further embodiment of an inventively designed roller bearing with a needle roller group.

Detailed description of the drawings

In the 1 an embodiment of a rolling bearing according to the invention is shown in three-dimensional view. The rolling bearing comprises a two-part bearing inner ring 1 , a one-piece bearing outer ring 2 and arranged therebetween rolling elements 3 that in a common Kä 4 be guided. The rolling elements 3 are as cylindrical rollers 5 and as needle rollers 6 formed, wherein the cylindrical rollers 5 perpendicular to the circumference of the bearing inner ring 1 are arranged. Both bearing rings 1 . 2 have axially centrally machined circumferential grooves 7 on, in which the cylindrical rollers 5 roll. Center between two adjacent cylindrical rollers 5 is a needle roller 6 arranged. The needle rollers 6 as well as the cylindrical rollers 5 are axially centered in the bearing inner ring 1 and in the bearing outer ring 2 arranged.

The 2 shows a cross section of an exemplary embodiment of a rolling bearing according to the invention. The structure of the rolling bearing shown is equal to the in 1 described rolling bearing. The cylindrical rollers 5 and the needle rollers 6 have different lengths L _Z , L _N and diameter D _Z , D _N. The needle rollers 6 have a length to diameter ratio greater than 2.5. The length L _{Z of} the illustrated cylindrical roller 5 is 25% of the length L _{N of} the needle roller 6 , The diameter D _{N of} the needle roller 6 is 50% of the diameter D _{Z of} the cylindrical roller 5 ,

In the 3 a further embodiment of a rolling bearing according to the invention is shown. The difference to 1 lies in the fact that between two adjacent and to the circumference of the bearing inner ring 1 vertical cylindrical rollers 5 Needle roller groups are arranged. The needle roller group shown consists of two circumferentially one behind the other needle rollers 6 where each needle roller 6 an equal distance to the nearest cylindrical roller 5 having.

LIST OF REFERENCE NUMBERS

1

 Bearing inner ring

2

 Bearing outer ring

3

 rolling elements

4

 Cage

5

 cylindrical roller

6

 needle roller

7

 Raceway of rolling elements / circumferential groove

L _Z

 Length of cylindrical roller

L _N

 Length of needle roller

D _Z

 Diameter cylindrical roller

D _N

 Diameter needle roller

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006044802 A1 [0002]
• DE 4142433 C1 [0003]
• DE 1898225 U [0003]
• DE 1060135 U [0004]
• DE 10225572 A1 [0005]
• DE 102011078712 A1 [0006]

Claims (10)

Rolling bearing with a bearing inner ring ( 1 ), a bearing outer ring ( 2 ) and arranged therebetween cylindrical rolling elements ( 3 ) on careers ( 7 ) of the bearing rings ( 1 . 2 ), wherein the rolling elements ( 3 ) have two different types with different lengths (L _Z , L _N ) and diameters (D _Z , D _N ) and both types have mutually crossed axes, characterized in that the rolling elements ( 3 ) as cylindrical rollers ( 5 ) and as needle rollers ( 6 ) and formed on a circumference of the bearing inner ring ( 1 ) are arranged, wherein the needle rollers ( 6 ) the cylindrical rollers ( 5 ) protrude axially on both sides. Rolling bearing according to claim 1, characterized in that the cylindrical rollers ( 5 ) and the needle rollers ( 6 ) in a common cage ( 4 ) are arranged. Rolling bearing according to claim 2, characterized in that the cage ( 4 ) consists of a metallic material. Rolling bearing according to claim 2, characterized in that the cage ( 4 ) consists of plastic. Rolling bearing according to one of the preceding claims, characterized in that the cylindrical rollers ( 5 ) perpendicular to the circumference of the bearing inner ring ( 1 ) are arranged. Rolling bearing according to one of the preceding claims, characterized in that between two adjacent cylindrical rollers ( 5 ) at least one needle roller ( 6 ) is arranged. Rolling bearing according to one of the preceding claims, characterized in that the length (L _Z ) of the cylindrical roller ( 5 ) is at most 40% of the needle roller length (L _N ). Rolling bearing according to one of the preceding claims, characterized in that the diameter (D _N ) of the needle roller ( 6 ) is at most 60% of the cylindrical roller diameter (D _Z ). Rolling bearing according to one of the preceding claims, characterized in that the cylindrical rollers ( 5 ) centrally between both end faces of the needle rollers ( 6 ) are arranged. Rolling bearing according to one of the preceding claims, characterized in that a bearing ring ( 1 . 2 ) is formed axially in two parts.

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