DE10342132A1 - Thin-race bearing is constituted as an inclined-roller bearing whose running surfaces are produced by a chipless forming process - Google Patents

Abstract

The thin-race bearing (1) is constituted as an inclined-roller bearing whose running surfaces (2.1, 3.1) are produced by a chipless forming process.

Description

field of use the invention

The The invention relates to a thin-ring bearing with a relative for bearing diameter very small cross-section with two bearing rings, between those on Roll raceways rolling elements.

background the invention

such Thin section bearings, in which, in contrast to standardized rolling bearing ranks the cross section with the bearing diameter does not or only slightly increases, there are as a four-point bearing, deep groove ball bearings and angular contact ball bearings in a bearing diameter range between 25 and 1000 mm. Main fields of application are handling devices, industrial robots, Textile and printing machines, medical, optical and optronic Equipment, Aerospace. The advantages of such generic thin-ring bearings are low mass, low torque and the ability to create space- and weight-saving constructions that are high Have rigidity and running accuracy. Such thin ring bearings are for example on page 10 of the book "The Wälzlagerpraxis", manual for the calculation and Design of bearings, Vereinigte Fachverlage GmbH, Mainz 1995 described.

Of the Disadvantage of the previously known Dünnringlager is that they are very much due to their cutting production are expensive. It is also disadvantageous that Dünnringlager to the previous state The technology require highly accurate bearing seats, which only by consuming grinding operations can be produced.

Summary the invention

task The invention is therefore, starting from the disadvantages of the previous State of the art to provide a new type of Dünnringwälzlagern in particular cost-effective finished.

According to the invention this Task according to the characterizing part of claim 1 in conjunction solved by the generic concept in that the thin-ring bearing as a tapered roller bearing is formed, by a non-cutting shaping process manufactured running wheels with a raceway area under one Angle inclined to a bearing axis are arranged and at its outer end a running in the direction of the bearing axis angled portion have, wherein the angled portion of a running disk extends almost into the raceway area of the other running disk.

Of the Advantage of the thin-film bearing according to the invention First and foremost is its simple production through the chipless technology. This term is to be interpreted in the context of the invention wide and should Include all known in the art Spanlosverfahren. One another advantage over the prior art is the increased bearing capacity of the thin-film bearing, by the line touch of the Rolls is realized. Another advantage is the increased dimensional stability of the pulleys, which is given by the angled area. Another one Advantage is the small gap width between the raceway area a runner and the angled portion of the walls ren Running disk. In this way, with simple means a close Gap seal formed. After all is also advantageous that due to the conical shape of the Sliding discs have a centering in a connecting construction in very easy way possible is, so that previously required elaborate cutting edits the bearing seats are dispensable.

Further advantageous embodiments of the invention are in the claims 2 to 4 described.

So goes from claim 2 shows that the angled portion of a Running disk has a bulge at one end, in the one Seal element is arranged. This additional sealing element can, for example be an elastic O-ring, the bearing inside completely Outside seals.

To another further feature according to the invention of claim 3 are the rolling elements in a cage made of polyamide. Polyamides (PA) are thermoplastics that are characterized by a good dimensional stability in the heat and by a good resistance against fuels and lubricants, so they in particular have found widespread use in the automotive industry.

Finally it works From claim 4, a thin-ring bearing in which two tapered roller bearings are employed against each other, with the inner discs the tapered roller bearing by a two bearing bearing surfaces bearing outer ring are spaced apart from each other while the outer running disks the tapered roller bearing taken from a bearing inner ring, which also has two inclined contact surfaces having an abutment surface formed by a screwed onto the bearing inner ring adjusting nut is.

On this way, a narrow-building storage unit is created, the greased and prestressed to the end user is available and there can be installed without effort in a connecting structure.

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

Short description the drawings

It demonstrate:

1 an enlarged view of a partial longitudinal section of a thin-film bearing according to the invention in the region of the raceways and

2 two against each other employed thin-ring bearings in a subsequent construction.

Full Description of the drawings

This in 1 shown and with the reference numeral 1 Provided tapered roller bearing consists of the two pulleys 2 and 3 that have a running track area 2.1 . 3.1 and an angled area 2.2 . 3.2 exhibit. Through this bend 2.2 . 3.2 will increase the stability of the running disk 2 . 3 increases, which in particular also has a very favorable effect in a heat treatment process to increase the hardness, because the hardness distortion is reduced. The career area 2.1 . 3.1 is at the angle α to the bearing axis 4 inclined, where α can assume a value between 45 ° and 60 °. To the track area 2.1 . 3.1 close in the radial direction to the outside, the angled areas 2.2 . 3.2 on, parallel to the bearing axis 4 run. Between both pulleys 2 . 3 are roles 5 arranged in the cage 6 are housed. This has circumferentially spaced apart and not designated rectangular pockets in which the rollers 5 are housed. As 1 further shows, the angled range extends 2.2 the running disk 2 almost into the raceway area 3.1 the running disk 3 so that between both the gap 7 is formed. The bearing rings 2 . 3 are made of Ck75 hardenable steel and have a hardness of about 670 HV after heat treatment. As 1 further shows the raceway areas 2.1 . 3.1 a thickness a greater than the thickness b in the angled region 2.2 . 3.2 is. The production of the pulleys 2 . 3 takes place in such a way that initially with the aid of a punching tool a circular ring is punched out, which is subsequently brought into its likewise conical shape with the aid of a conical mandrel, before the angled region is extruded 2.2 . 3.2 is molded.

• – Dicke der Laufscheiben 2, 3 im Laufbahnbereich 2.1, 3.1 a = 0,63 mm
• – Dicke der Laufscheiben 2, 3 im abgewinkelten Bereich 2.2, 3.2 b = 0,5mm
• – Breite des Spaltes 7 c = 0,2 mm
• – Abstand von Laufscheibe 2 zu Laufscheibe 3 in deren Laufbahnbereichen 2.1, 3.1 d = 2,76 mm
• – axiale Ausdehnung der Laufscheiben 2, 3 im abgewinkelten Bereich 2.2, 3.2 e = 1,5mm

To illustrate the miniaturization or thinness of the illustrated bearing, real values are given below for a radius R = 100 mm:

• - Thickness of the pulleys 2 . 3 in the raceway area 2.1 . 3.1 a = 0.63 mm
• - Thickness of the pulleys 2 . 3 in the angled area 2.2 . 3.2 b = 0.5mm
• - width of the gap 7 c = 0.2 mm
• - Distance from running disk 2 to running disk 3 in their career areas 2.1 . 3.1 d = 2.76 mm
• - Axial expansion of the pulleys 2 . 3 in the angled area 2.2 . 3.2 e = 1.5mm

In 2 are two in O arrangement against each other employed tapered roller bearings 1 shown as a component of a flange-mounted or bolt-on bearing unit. Such a bearing unit can be used, for example, advantageously as a fixed bearing for a threaded spindle. The bearing outer ring belongs to the bearing unit 8th , the two inclined contact surfaces 8.1 having the axially inner pulleys 2 the tapered roller bearing 1 separate each other. The outer running disks 3 the tapered roller bearing 1 are from the bearing inner ring 9 taken, which also has two inclined contact surfaces 9.1 has, wherein the right-side contact surface 9.1 through the adjusting nut 10 is formed, with its internal thread on an external thread of the bearing inner ring 9 can be screwed on. How out 2 further recognizable, is the case of the two tapered roller bearings 1 existing gap 7 through a sealing element 11 closed, in a bulge of the angled area 2.2 the running disk 2 is arranged. The roles 5 are in the cage 12 held in the manner of a comb cage in the radial direction outwardly open pockets, so that the rollers 5 at the break point at the transition area between the raceway area 2.1 and the angled area 2.2 the running wheels 2 start. In the unspecified mounting hole of the bearing inner ring 9 Now, a spindle, not shown, is introduced and with the aid of a counter system 13 firmly fixed, being in the bearing inner ring 9 arranged fastening screws 13.1 unspecified left side arranged parts of the bearing inner ring 9 press on the threaded spindle. The bearing outer ring 8th is provided in a manner not shown at a plurality of equally spaced circumferential locations with axial openings, which allow fixing with fixing screws also not shown on a connecting structure.

In the 2 Boltable bearing unit shown can be further improved when in this two-sided rolling bearing the finely turned, dimensionally stable bearing rings 8th . 9 made of high-strength aluminum. In this way, a corrosion-resistant lightweight construction is realized whose mass moment of inertia is reduced. In addition, through the bearing rings 8th . 9 Made of aluminum due to a good thermal conductivity, the resulting frictional heat dissipated faster in the warehouse. By the adjusting nut 10 can be biased in an advantageous manner, the bearing unit, with the angular, very thin trained pulleys 2 . 3 stamp-like axially on the finely turned connection cones of the bearing rings 8th . 9 invest. The 2 also shows that the bearing unit on one side by the sealing elements 11 Well sealed on the outside, but on the other hand, a tracking of lubricant through the radial bore 8.2 is also possible without problems.

1

Tapered roller bearings

2

sheave

2.1

Raceway region

2.2

angled Area

3

sheave

3.1

Raceway region

3.2

angled Area

4

bearing axle

5

role

6

Cage

7

gap

8th

Bearing outer ring

8.1

contact surface

8.2

drilling

9

Bearing inner ring

9.1

contact surface

10

adjusting nut

11

sealing element

12

Cage

13

lock system

13.1

fixing screw

a

thickness

b

thickness

c

gap width

d

distance

e

axial expansion

R radius

α

tilt angle

Claims (4)

Thin-section bearing having a very small cross-section with respect to the bearing diameter with two bearing rings between which rolling elements roll on associated raceways, characterized in that it acts as a tapered roller bearing ( 1 ) is formed, which produced by a non-cutting shaping process running discs ( 2 . 3 ) with a track area ( 2.1 . 3.1 ) at an angle α inclined to a bearing axis ( 4 ) are arranged and at its outer end in the direction of the bearing axis ( 4 ) extending angled region ( 2.2 . 3.2 ), wherein the angled region ( 2.2 ) of a running disk ( 2 ) almost into the career area ( 3.1 ) of the other running disk ( 3 ). Thin-section bearing according to claim 1, characterized in that the angled region ( 2.2 ) of a running disk ( 2 ) has a bulge at one end, in which a sealing element ( 11 ) is arranged. Thin-section bearing according to claim 1, characterized in that the rolling elements ( 5 ) in a cage ( 6 . 12 ) are made of polyamide. Thin-section bearing according to claim 1, characterized in that two tapered roller bearings ( 1 ) are employed against each other, wherein the inner running discs ( 2 ) of tapered roller bearings ( 1 ) by a two inclined contact surfaces ( 8.1 ) having bearing outer ring ( 8th ) are spaced apart, while the outer running discs ( 3 ) of tapered roller bearings ( 1 ) from a bearing inner ring ( 9 ), which also has two inclined contact surfaces ( 9.1 ), wherein a contact surface ( 9.1 ) by a on the inner ring ( 9 ) screw-on adjusting nut ( 10 ) is formed.