DE102013015408A1 - Method for manufacturing rolling bearing for crankshaft of internal combustion engine of e.g. passenger car, involves selecting rolling element based on outer and inner diameters of inner and outer bearing rings respectively - Google Patents

Abstract

The method involves providing inner bearing ring (28) and outer bearing ring (30) of rolling bearing (26) for supporting the crankshaft (12). The inner bearing ring is mounted on crankshaft. The outer diameter of inner bearing ring is detected, and outer bearing ring is mounted on bearing support (16) and bearing cap (18) of engine. The inner diameter of outer bearing ring is detected. The rolling element (32) is selected based on detected outer diameter of inner bearing ring and inner diameter of outer bearing ring, and is mounted between inner and outer bearing rings.

Description

The invention relates to a method for producing a roller bearing for a shaft of an internal combustion engine.

From the general state of the art, in particular from the mass-produced vehicle storage arrangements of waves on components of internal combustion engines are well known. Such a shaft is, for example, a crankshaft of the internal combustion engine designed as a reciprocating internal combustion engine. The crankshaft is rotatably mounted on a housing element of a crankcase of the reciprocating internal combustion engine about an axis of rotation relative to the housing element.

To represent a particularly low-friction bearing of the shaft (crankshaft), for example, a rolling bearing is used. Such a roller bearing comprises at least one roller bearing, via which the shaft is rotatably mounted on the corresponding component relative to the component. Such a roller bearing usually comprises a mounted on or on the shaft bearing inner ring and a corresponding with the bearing inner ring and mounted on the component bearing outer ring. In the state of the shaft mounted on the component via the roller bearing, the bearing inner ring is at least partially covered by the bearing outer ring in the radial direction to the outside. Furthermore, the rolling bearing comprises rolling elements, which are arranged in the radial direction between the bearing inner ring and the bearing outer ring. The rolling elements can roll on the one hand on an inner peripheral side running surface of the bearing outer ring and on the other hand on an outer peripheral side running surface of the bearing inner ring, so that for example the bearing inner ring is supported in the radial direction on the bearing outer ring on the rolling elements.

Such a rolling bearing usually has a radial rolling bearing clearance, which is commonly referred to as bearing clearance or radial clearance. Under the bearing clearance is understood the measure by which, for example, the bearing inner ring relative to the bearing outer ring in the radial direction can be moved from a limit position to an opposite, further limit position without measuring load.

The clearance is not a qualitative, but a constructive feature. With regard to good kinematic conditions, favorable load distribution within the rolling bearing and high guidance accuracy, the bearing clearance should be only a few micrometers when installed and ready for operation. Radial play classes are for example in the DIN 620 / T4 established. The degree of required radial clearance is determined by fit, heat balance and loads. Preferably, the radial bearing clearance and the radial bearing clearance is selected so that the rolling bearing is not distorted by the installation and operation.

Object of the present invention is therefore to provide a method for producing a rolling bearing for a shaft of an internal combustion engine, by means of which the bearing clearance can be adjusted very precisely.

This object is achieved by a method having the features of patent claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.

In a first step of the method according to the invention for producing a roller bearing for a shaft of an internal combustion engine, at least one bearing inner ring and at least one bearing outer ring of a rolling bearing separate from the bearing inner ring are provided for supporting the shaft. This means that not the already assembled rolling bearing is provided as a whole. Rather, the bearing inner ring and the bearing outer ring, which are also referred to as bearing rings, as separate from each other, d. H. provided as non-interconnected components.

In a second step of the method, the bearing inner ring is mounted on or on the shaft. In a third step of the method, an outer diameter of the bearing inner ring is detected. In a fourth step of the method, the bearing outer ring is mounted on a component of the internal combustion engine. In a fifth step of the method, an inner diameter of the bearing outer ring is detected. In a sixth step of the method, rolling elements for the rolling bearing are selected as a function of the detected outer diameter and the detected inner diameter. Finally, in a seventh step of the process, the selected rolling elements are mounted. The steps of the method need not necessarily be carried out in the stated order. It is easily possible to carry out the steps also in a different order from the order mentioned.

By means of the method according to the invention, the radial bearing clearance or the radial bearing clearance of the rolling element can be set particularly precisely and kept to a particularly low level. The invention is based on the finding that a rolling bearing for supporting a shaft usually as a whole, ie as an assembled component from Manufactured and supplied. Here, the bearing inner ring, the bearing outer ring and the rolling elements are already mounted and classified with respect to their storage air. However, since all components involved in the rolling bearing, such. B. the shaft, the component, the bearing rings themselves and the rolling elements, for example, with about 50 microns are tolerant, the bearing air in a conventional manner, ie if the rolling element is already provided as an assembled component, not or only with great effort with the desired accuracy can be set.

However, this is now possible by the method according to the invention, since the rolling bearing is not already mounted and classified covered, but the bearing rings is procured as standard parts preferably with the same nominal size and tolerances. The rolling elements can therefore be selected according to need as a function of the inner diameter and the outer diameter, so that it is possible, for example, to select those rolling elements from a plurality of different rolling elements, by means of which the bearing clearance can be adjusted to 4 microns accurate.

Preferably, it is provided that the outer diameter of the bearing inner ring is detected in mounted on the shaft state of the bearing inner ring. Furthermore, it is alternatively or additionally provided that the inner diameter of the bearing outer ring is detected in the mounted on the component of the internal combustion engine state of the bearing outer ring. As a result, for example, a deformation of the respective bearing ring caused by the mounting of the respective bearing ring and also having an effect on the outer diameter or inner diameter flows into the detection of the outer diameter or inner diameter, so that such deformations are taken into account, in particular in the selection of the rolling bodies.

Advantageously, it is provided that a difference between the inner diameter and the outer diameter is calculated, wherein the rolling elements are selected as a function of the calculated difference. From the difference, for example, a diameter of the specific pairing of bearing inner ring and bearing outer ring matching rolling elements can be determined, so that then rolling elements can be arranged or introduced with this specific diameter between the bearing inner ring and the bearing outer ring.

The invention is thus based on the idea to procure or provide the bearing inner ring and the bearing outer ring as equal parts whose outer and inner diameter are subject to manufacturing tolerances and can be further modified by respective mounting on tolerant components such as the shaft or the component.

The rolling elements may be classified, for example, according to outside diameter, for example in 2-micron steps, in particular with a tolerance of ± 1 micron in the outer diameter. This classification can z. B. color, so that no confusion of rolling elements different outer diameter nominal dimensions can occur. This makes it possible to produce in a particularly simple time and cost-effective manner a rolling bearing or a roller bearing whose radial bearing clearance can be adjusted particularly accurately to, for example, 4 microns.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings; these show in:

1 a fragmentary sectional view through a bearing arrangement of a shaft in the form of a crankshaft to a crankcase of an internal combustion engine, wherein the crankshaft is mounted on at least one rolling bearing on the crankcase; and

2 partially a schematic and perspective sectional view through the storage arrangement.

1 and 2 show a whole with 10 designated storage arrangement at a in 1 fragmentary recognizable waveform of a crankshaft 12 on a crankcase 14 a trained as a reciprocating internal combustion engine internal combustion engine. The reciprocating internal combustion engine is used for example as a drive unit for driving a motor vehicle, in particular a passenger car. On the crankcase 14 is in 1 a first housing element in the form of a bearing chair 16 recognizable. Further, from the crankcase 14 a second housing part in the form of one with the bearing block 16 corresponding bearing cap recognizable. How out 1 It can also be seen that the bearing cap 18 separately from the camp chair 16 trained and by means of screws 20 associated with this. The bearing cap 18 and the camp chair 16 each half limit a camp admission 22 , which are also commonly referred to as a bearing bore. I'm at the crankcase 14 stored condition penetrates the crankshaft 12 , in particular a crank pin 24 the crankshaft 12 the trained as a through hole bearing bore.

To realize a particularly low-friction bearing of the crankshaft 12 on the crankcase 14 is a rolling bearing with at least one rolling bearing 26 intended. About the rolling bearing 26 is the crankshaft 12 on the crankcase 14 about an axis of rotation relative to the crankcase 14 rotatably mounted. The rolling bearing 26 includes a bearing inner ring 28 , a bearing outer ring 30 and in the radial direction between the bearing inner ring 28 and the bearing outer ring 30 arranged rolling elements 32 , The rolling elements 32 can be designed as balls or cylindrical rollers. The bearing inner ring 28 and the bearing outer ring 30 are also referred to as bearing rings.

In the following, a method for producing the rolling bearing is described, by means of which the radial position play or the radial bearing clearance of the rolling bearing 26 in a particularly simple, time-consuming and cost-effective way, particularly accurate, for example, set to 4 microns accurate.

In a first step of this process, the bearing inner ring 28 and the bearing outer ring 30 provided in mutually separate, ie unconnected state. This means that the rolling bearing 26 not classified with respect to the storage air and referred to as an assembled component. Rather, the bearing rings (bearing inner ring 28 and bearing outer ring 30 ) as separate standard parts, preferably with the same nominal dimensions and tolerances.

In a second step of the process, the bearing inner ring 28 on the crankshaft 12 mounted by the bearing inner ring 28 on the crank pin 24 is pressed on. In a third step of the process, the bearing outer ring 30 on the crankcase 14 mounted by, for example, in the bearing receiver 22 between the camp chair 16 and the bearing cap 18 is pressed. Depending on the exact dimension of the joint partners (crank pin 24 or bearing cap 18 and storage chair 16 ), the bearing rings are slightly more or less stretched or compressed.

In a fourth step of the method becomes an outer diameter of the bearing inner ring 28 detected. On this outer diameter of the bearing inner ring is an outer peripheral side tread 34 of the bearing inner ring 28 arranged, with the rolling elements 32 in the finished state of the storage arrangement 10 on the outer peripheral side tread 34 can roll off. In a fifth step of the method becomes an inner diameter of the bearing outer ring 30 detected. On this inner diameter is an inner circumferential tread 36 of the bearing outer ring 30 arranged. In the finished state of the rolling bearing, the rolling elements 32 on the inner peripheral side tread 36 roll off.

The mentioned, from the respective assembly of the bearing rings on the crankcase 14 or on the crankshaft 12 resulting strain or compression affects the inner diameter or the outer diameter. In the case of the outer diameter and the inner diameter, the expansion and the compression of the bearing rings are recorded or taken into account when the outer diameter or inside diameter is detected.

For example, a difference is calculated from the measured inner diameter and the measured outer diameter. Depending on the calculated difference, the rolling elements now become the sixth step from a multiplicity of different rolling elements 32 selected. As a result, from the difference between the inner diameter and the outer diameter of the diameter of this specific pairing of the bearing inner ring 28 and the bearing outer ring 30 be determined matching rolling elements. Finally, in a seventh step, the rolling elements become 32 mounted with this specific diameter, placing between the bearing inner ring 28 and the bearing outer ring 30 be introduced.

As in the process, the rolling bearing 26 is not provided as an assembled component but the bearing rings are provided as separate components, it is possible, the rolling elements 32 to select and assemble in accordance with requirements of the bearing rings in their respective mounted state. About the inner diameter and the outer diameter of a classified set of rolling elements with the bearing rings can be paired and mounted, whereby the radial bearing clearance and the radial bearing clearance can be set, for example, to 4 microns accurate.

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 non-patent literature

• DIN 620 / T4 [0005]

Claims (5)

Method for producing a roller bearing for a shaft ( 12 ) of an internal combustion engine, comprising the steps of: - providing at least one bearing inner ring ( 28 ) and at least one of the bearing inner ring ( 28 ) separate bearing outer ring ( 30 ) of a rolling bearing ( 26 ) for supporting the shaft ( 12 ), - mounting the bearing inner ring ( 28 ) on the shaft ( 12 ), - detecting an outer diameter of the bearing inner ring ( 28 ), - mounting the bearing outer ring ( 30 ) on at least one component ( 16 . 18 ) of the internal combustion engine, - detecting an inner diameter of the bearing outer ring ( 30 ), - selecting rolling elements ( 32 ) for the rolling bearing ( 26 ) depending on the detected outer diameter and the detected inner diameter, - mounting the selected rolling elements ( 32 ). A method according to claim 1, characterized in that the outer diameter of the bearing inner ring ( 28 ) im on the wave ( 12 ) mounted state of the bearing inner ring ( 28 ) is detected. Method according to one of claims 1 or 2, characterized in that the inner diameter of the bearing outer ring ( 30 ) in the component ( 16 . 18 ) of the internal combustion engine mounted state of the bearing outer ring ( 30 ) is detected. Method according to one of the preceding claims, characterized in that a difference between the inner diameter and the outer diameter is calculated, wherein the rolling elements ( 32 ) depending on the calculated difference. Method according to one of the preceding claims, characterized in that as the shaft ( 12 ) a crankshaft ( 12 ) and / or as the device ( 16 . 18 ) a housing element ( 16 . 18 ) of a crankcase ( 14 ) of the internal combustion engine is used.

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