DE10348064A1 - Rotationally symmetric construction unit e.g. for production of bearing ring of radial roller bearings, has at its lateral surface spin-free rotation cutter with lateral surface is worked on in hardened condition - Google Patents

Abstract

The unit has at its lateral surface a spin-free rotation cutter. The lateral surface is worked on in a hardened condition and a sealing surface is formed. A sealing rim lies close to a preloaded seal. The unit is formed by a lateral surface of an inner ring (2) having a radial antifriction bearing. An outer ring is concentrically mounted where between both rolling members (4) are arranged. The seal arranged in the outer ring is protected against the lateral surface of the inner ring under pre-loading. The inner ring has a chamfered profile.

Description

field of use the invention

The The invention relates to a rotationally symmetrical component, the lateral surface of which a spin-free turning is machined.

background the invention

The Turning of rotationally symmetrical parts is in rolling bearing technology known for a long time. For example, bearing rings of radial roller bearings manufactured such that from a starting material first a Bearing ring blank is machined. Subsequently, will through a heat treatment the required hardness realized the raceways before through a complex grinding process the final dimensions of the bearing ring are produced.

in the Normally, the so-called longitudinal turning is used, in which an axial displacement of the cutting tool takes place on the processing surface. However, this is a surface generated, which is swirling. This has regular structures in the form of grooves or ridges Elevations on, which correspond to a thread structure and through the feed of the tool along the rotating workpiece a Create slope. Such a swirling surface promotes by means the thread-shaped Scoring or burrs of lubricant past the adjacent seal, from one side to the other in the axial direction, so that the sealing effect the seal is significantly reduced. In addition, on such a swirling surfaces fitting sealing elements on the contact lines or contact surfaces the thread-shaped Ridges or elevations damaged become, or are at least very much stressed. By doing so entering wear or damage If the sealing effect is also reduced again.

In In this context, it is also known that the so-called Einstechdrehen of rotationally symmetrical surfaces, the thread-like design seeks to avoid this by the tool regarding the to be machined workpiece only moved radially, so that because of the lack of axial movement a twist-free surface is formed. However, if the piercing in the axial direction is as wide as the total to be machined rotationally symmetric Area, Especially in the processing of hardened surfaces very high cutting forces on, causing instability and thus again to surface irregularities leads.

In In this context, it is also known, the twist of the surface in such a way to avoid having an extra Grinding the surface is applied. This means that the workpiece is on a different machine is to be clamped, so that an increase in price occurs. It was also found that even with a grinding generates swirl structures can be which negatively affect the tightness of a seal.

Finally, in the recent past, a new method for twist-free machining of rotationally symmetric surfaces has become known. This new manufacturing process is referred to as tangential rotation and ensures that can be influenced by a relation between the axial and tangential feed component of the cutting tool, the twist of the Oberflä surface of the workpiece. This new process is detailed in the prior publications DE 199 63 897 A1 and DE 101 44 649 A1 described so that no detailed explanation is required here.

Summary the invention

It It is therefore an object of the invention that methods known per se for machining of rotating rotationally symmetric Workpieces, in which only an insignificant twist on the workpiece surface occurs, to apply in rolling bearing technology.

According to the invention this Task according to the characterizing part of claim 1 in conjunction solved with the preamble in that the lateral surface in the cured state is processed and a sealing surface forms, at least one sealing lip of a sliding seal under bias is applied.

An advantage of the solution according to the invention lies in the fact that its conveying effect for lubricants is excluded by the swirl-free surface. Due to the improved sealing effect, no lubricant is conducted from the inside of the bearing to the outside, so that its service life is increased. It is also advantageous that the sealing lips are less stressed by missing thread-like grooves through the twist-free and thus much smoother surface and consequently wear much less and thus once again contribute to increasing the life of the bearing. Another advantage is the fact that hardening distortions are eliminated in a simple manner by processing the lateral surface in the cured state. An additional machining process that takes the measure accuracy of the component restores, so is unnecessary.

Further advantageous embodiments of the invention are described in the subclaims.

So is provided according to claim 2, that the sealing surface formed by the inner ring of a radial rolling bearing is that of an outer ring is taken concentrically, being arranged between the two Rolling on associated Roll raceways, the two outwards by one in the outer ring arranged seal protected are whose sealing lips under prestress on the lateral surface of the Inner ring abut.

To another additional Feature according to claim 3 should the sealing surface from a lateral surface an arranged on a shaft inner ring to be formed on the at least one sealing lip of a shaft sealing ring under prestress is applied. This arrangement has the advantage that by the on Shaft deferred inner ring the shaft no hardening process to be subjected to.

Finally is according to a further feature according to claim 4 provided that the arranged on the shaft inner ring at least provided at one axial end with a slip chamfer. By This chamfer facilitates assembly, as it slides over the sealing lip is facilitated.

The Invention will be explained in more detail in the following embodiments.

Short description the drawings

It demonstrate:

1 a partial section through an inventive deep groove ball bearing,

2 a partial section through an arranged on a shaft radial shaft seal according to the prior art and

3 an inner ring shown in perspective according to the invention.

Full Description of the drawings

In 1 is an outer ring with 1 and an inner ring with 2 designated. Between the two are in a cage 3 guided rolling elements 4 arranged on associated raceways 10 . 11 roll. The deep groove ball bearing is on both sides of seals 5 sealed, consisting of a stiffening part 6 and an elastomeric part 7 consist. The seals 5 are in the outer ring 1 snapped and lie with their sealing lips 8th on a sealing surface 9 on, which is part of the outer surface of the inner ring 2 forms. In the exemplary embodiment is intended in the context of the invention, the sealing surface 9 in the axial direction on both sides of the end face of the inner ring 2 until the beginning of the groove-shaped career 10 extend.

In accordance with the invention, at least the sealing surface 9 of the inner ring 2 of the deep groove ball bearing swirl-free, ie, formed without thread-like grooves. This is done in such a way that the sealing surface 9 the already hardened inner ring 2 is subjected to a tangential turning, as described in detail in the already mentioned DE 199 63 987 A1 and the DE 101 44 649 A1 is described. As a result, a surface quality with a roughness of Rz of about 1.85 μm can be achieved, which is a further after-treatment of the sealing surface 9 For example, by intensive grinding, unnecessary.

In 2 is one on a wave 12 mounted radial shaft seal 13 shown. This has a stiffening ring 14 on the part of an elastomer 15 is surrounded. From the elastomer part 15 branch a sealing lip 16 and a protective lip spaced axially therefrom 17 Both are biased against the lateral surface of the shaft 12 issue. The preload of the sealing lip 16 is by a spring element 18 reinforced, which is the sealing lip 16 concentrically surrounds and against the lateral surface of the shaft 12 pressed. It is obvious that also here the sealing effect of the radial shaft seal 13 is impaired when the wave 12 On its lateral surface grooves or ridge-shaped elevations in the form of a thread structure.

For the purposes of the invention, the lateral surface 20 an inner ring 19 according to 3 be made by twist-free rotation, wherein the lateral surface 20 equal to the sealing surface 22 is and the inner ring 19 on the wave 12 according to 2 is pushed, so that the two sealing lips 16 and 17 of the radial shaft seal 13 at the sealing surface 22 support under prestressing.

1

outer ring

2

inner ring

3

Cage

4

rolling elements

5

poetry

6

stiffener

7

elastomer part

8th

sealing lip

9

sealing surface

10

career

11

career

12

wave

13

Radial shaft seal

14

stiffening ring

15

elastomer part

16

sealing lip

17

protective lip

18

spring element

19

inner ring

20

lateral surface

21

chamfer

22

sealing surface

Claims (4)

Rotationally symmetric component ( 2 . 19 ), whose lateral surface is machined by a spin-free turning, characterized in that the lateral surface is machined in the cured state and a sealing surface ( 9 . 22 ), at the at least one sealing lip ( 8th . 16 . 17 ) of a sliding seal ( 5 . 13 ) is applied under prestress. Sealing surface ( 9 ) according to claim 1, characterized in that it from a lateral surface of an inner ring ( 2 ) is formed of a radial rolling bearing, of an outer ring ( 1 ) is received concentrically, wherein between two arranged rolling elements ( 4 ) on associated careers ( 10 . 11 ) on both sides to the outside by one in the outer ring ( 1 ) arranged seal ( 5 ), whose sealing lips ( 8th ) under pretension on the lateral surface of the inner ring ( 2 ) issue. Sealing surface ( 22 ) according to claim 1, characterized in that it from a lateral surface ( 20 ) one on a wave ( 12 ) arranged inner ring ( 19 ) is formed on the at least one sealing lip ( 16 ) of a shaft sealing ring ( 13 ) is applied under prestress. Inner ring ( 19 ) according to claim 3, characterized in that it has at least one axial end with a slip chamfer ( 21 ) is provided.