DE102011004630A1 - rolling elements - Google Patents

Abstract

A rolling element (5) has a lateral surface (9) provided for rolling on a bearing ring (2, 3) of a rolling bearing (1), and a bore (()) for receiving a bolt (11) in a cage (6) of the rolling bearing (1). 10), a sliding contact being able to be established between the inner surface (8) of the rolling element (5) given by the bore (10) and the bolt (11). At least the inner surface (8) is induction hardened.

Description

Field of the invention

The invention relates to a provided for use in a pin cage having a rolling bearing, hollow rolling elements and a method for producing such a rolling element.

Background of the invention

A rolling element of the type mentioned is for example from the DE 10 2007 031 792 A1 known. The rolling element is designed as a cylindrical roller and represents a component of a roller bearing with a pin cage. The rolling element can be made of case hardened steel and case hardened.

A well-known method for hardening of rolling bearing components, for example, in DE 100 20 118 B4 disclosed. The rolling bearing is designed in this case as a needle bearing.

The DE 10 2009 031 064 A1 relates to a bearing assembly which also has needle rollers as rolling elements. Parts of the bearing assembly are inductively hardened in this case.

Object of the invention

The invention has for its object to provide a suitable for a rolling bearing, in particular cylindrical roller bearing, with a pin cage, good wear properties, rationally producible rolling elements and to provide a corresponding manufacturing process.

Summary of the invention

This object is achieved by a rolling element having the features of claim 1 or by a method having the features of claim 8.

The rolling element has a cylindrical, frusto-conical or barrel-shaped basic shape and a central bore. The bore can be designed as a through hole or blind hole. In any case, the bore is provided to engage in a pin of a rolling bearing cage. Between the bolt and the bore describing the inner surface of the rolling element is thus given a sliding contact during operation of the rolling bearing. According to the invention, the inner surface is inductively hardened. Other surfaces of the rolling element are its end faces and its lateral surface.

• – eine einzige Stirnfläche,
• – beide Stirnflächen,
• – eine einzige Stirnfläche und die Mantelfläche,
• – beide Stirnflächen und die Mantelfläche.

In addition to the inner surface, the following further surface or the following further surfaces can be optionally inductively hardened:

• A single face,
• - both faces,
• A single end face and the lateral surface,
• - Both end faces and the lateral surface.

In order to inductively heat the inner surface of the rolling element as part of the hardening process, a tool suitable for this purpose, which has at least one coil, can be introduced into the bore of the rolling element. The hardness of the inner surface achievable with this method is at least 650 HV 0.3, in particular at least 700 HV 0.3.

The advantage of the invention is in particular that a cost-effective tempering steel can be used for a roller bearing with a pin cage, which is suitable for inductive hardening.

An embodiment of the invention will be explained in more detail with reference to a drawing. Herein show:

Short description of the drawing

1 a rolling bearing with a bolt cage,

2 a rolling element of the bearing after 1 in plan view,

3 a sectional view of the rolling element after 1 ,

Detailed description of the drawing

A total with the reference numeral 1 characterized rolling bearing, namely cylindrical roller bearings, has an inner ring 2 , an outer ring 3 , as well as between these bearing rings 2 . 3 rolling rolling elements 5 on. To guide the trained as cylindrical rollers rolling elements 5 is a cage 6 , namely bolt cage, provided by two cage washers 4 and a number of these connecting bolts 11 having, each bolt 11 a hole 10 a rolling element 5 penetrates.

The in the 2 and 3 schematically illustrated rolling elements 5 each have one on the bearing rings 2 . 3 rolling lateral surface 9 , two faces 7 , as well as a bore 10 delimiting inner surface 8th on. Each of the surfaces 7 . 8th . 9 of the rolling element 5 is inductively hardened.

Deviating from the embodiment of the 1 - 3 can the rolling bearing 1 For example, be designed as a tapered roller bearing, roller bearings or ball roller bearings.

LIST OF REFERENCE NUMBERS

1

roller bearing

2

inner ring

3

outer ring

4

cage washer

5

rolling elements

6

Cage

7

face

8th

inner surface

9

lateral surface

10

drilling

11

bolt

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 102007031792 A1 [0002]
• DE 10020118 B4 [0003]
• DE 102009031064 A1 [0004]

Claims (8)

Rolling elements ( 5 ), with one for unrolling on a bearing ring ( 2 . 3 ) of a rolling bearing ( 1 ) provided lateral surface ( 9 ), as well as with a for receiving a bolt ( 11 ) of a cage ( 6 ) of the rolling bearing ( 1 ) provided bore ( 10 ), whereby a sliding contact between the through the bore ( 10 ) given inner surface ( 8th ) of the rolling element ( 5 ) and the bolt ( 11 ), characterized in that the inner surface ( 8th ) is inductively hardened. Rolling elements ( 5 ) according to claim 1, characterized in that in addition the lateral surface ( 9 ) of the rolling element ( 5 ) is inductively hardened. Rolling elements ( 5 ) according to claim 1 or 2, characterized in that in addition at least one end face ( 7 ) of the rolling element ( 5 ) is inductively hardened. Rolling elements ( 5 ) according to one of claims 1 to 3, characterized in that the lateral surface ( 9 ) is cylindrical. Rolling elements ( 5 ) according to one of claims 1 to 3, characterized in that the lateral surface ( 9 ) is cone-shaped. Rolling elements ( 5 ) according to one of claims 1 to 3, characterized in that the lateral surface ( 9 ) is barrel-shaped. Rolling elements ( 5 ) according to one of claims 1 to 6, characterized in that the hardness of the inner surface ( 8th ) is at least 650 HV 0.3. Method for producing a rolling element ( 5 ) of a rolling element blank, comprising the following steps: - a bore ( 10 ) having Wälzkörper- blank is made, - in the bore ( 10 ) existing inner surface ( 8th ) of the rolling element blank is inductively from the bore ( 10 ) hardened.

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