DE4239770A1 - Bearing fitting for flywheel - has one piece retaining seat with shoulder to hold bearing axially. seat face being chamfered for ease of fit - Google Patents

Abstract

The assembled bearing (39) is press-fitted into its seat and requires no additional fastenings. The bearing is axially pushed over a shoulder (37) to align in a prepared mounting (36), and with the other face pushed against a radial flange (35) of the mounting. The shoulder is such as to permit elastic displacement when the bearing is pressed home. The shoulder can also be adjusted by heat treatment to allows simple assembly. The entry face of the seating in chamfered (38) for simple fitting. ADVANTAGE - One piece assembly, simple assembly process.

Description

The invention relates to a receptacle for radial fixed mounting of a rolling bearing on one of its rings one at least essentially over the axial extent same reaching seat and at the end areas of the seat provided radial projections for axially fixing the Bearing, the bearing from one side axially with its Seat can be brought together.

Rolling bearings in which the bearing is axial from one side can be brought together with its seat in many designs known forms. For example, the inner ring of a rolling bearing pushed onto its seat over a shaft, until it axially on a shaft shoulder or a Paragraph is pending. To protect against a relocation of the Inner ring in the opposite of the mounting direction Axial direction is the inner ring on that of the shaft shoulder opposite side, for example by a wave nut and a lock washer or by one on the Front of the shaft screwed disc or through Detonating or snap rings set. Often, too  Spacer or spacer sleeves or support or shim washers Additionally arranged. They are of a similar design usual designs of recordings for the outer ring of a Rolling bearing. The outer ring of the bearing is axially in here too pushed its seat until it protrudes at a radially Confederation. For axial securing in the opposite direction again serve different elements, such as again circlips or circlips or one Centering approach of a bearing cover. From the examples mentioned len shows that for the axial fixing of the bearing each additional parts are required, both the Increase the cost of the construction unit and the required storage, are often difficult to assemble and smooth Hinder automation of the assembly process considerably can.

The present invention was based on the object positive locking of a rolling bearing in the axial direction to ensure without providing additional components and this protection against axial displacement with as much as possible to be able to perform a small space requirement in the axial direction. Furthermore, this device for attaching a Rolling bearing ring to be easy to manufacture, by a reduction the necessary work or assembly steps in business Licher be executable and the disadvantages mentioned Eliminate previous axial specifications.  

This is achieved according to the invention in that at least the projection facing the mounting side with the seat integrally formed, when mounting the bearing ela is deformable waistband.

An axial definition of a rolling bearing by two pieces with the bearing seat trained collar areas or rims known from DE-GM 84 12 116, but there is the federal government not so elastic that an undivided bearing over this covenant could be pushed onto its seat. To do that The races are still able to mount bearings blown up, that is, they are at one point on the circumference broken axially so that they can widen if necessary.

During assembly, the warehouse is expanded, that is, in Inner diameter enlarged, then axially over the rim pushed, at the axial height of the bearing seat in diameter again reduced and in the corresponding to the camp seat Diameter maintained. That means the real one Assembly to establish the functional connection between Bearing seat and bearing ring in the radial direction.

An advantageous embodiment of the recording according to the invention can provide that the opposite direction of assembly Projection is dimensioned such that it is in axis is an insurmountable obstacle to the camp that means that this lead or covenant can be a conventional one Wise stop, such as a shaft be a sentence. Furthermore, it can be useful  if the federal government has a closed configuration, if this elastically deformable collar in the circumferential direction considered uninterrupted and at every point of the Has the same radial height circumferentially.

A particularly advantageous design of the Recording according to the invention can provide that the outer ring is received in a sleeve-like area and that the axially projecting area at least over the axial Er extension of the federal government is weakened. These This can result in targeted weakening of the sleeve-like area take place that axially limits the wall thickness over the entire Scope is reduced. It can be particularly useful prove if the bearing seat for the outer ring as the rear stitch is formed, so if this outer ring between two fret areas is included. The axial Fixation should also be dimensioned so that the bearing ring limited axially displaceable between the two collar areas is, so that this bearing is designed as a floating bearing.

On the other hand, the bearing ring can be used to form a fixed bearing be axially fixed, it is still possible to Inner ring of a rolling bearing on a shaft between two radial projections at the end regions of the seat fix.

It can be particularly advantageous if the sleeve-like Area has a lead-in chamfer that the assembly of the Rolling bearings relieved that the outer ring during  the assembly process is centered. The assembly of the roller Bearing can with the appropriate dimensioning of the radial Projections or the radial projection substantially at Room temperature or at essentially the same temperature of rolling bearings and the part bearing the bearing seat.

However, it can also prove to be advantageous if for Assembly of the rolling bearing in a bore, at least the collar has a higher temperature than the bearing. This can achieved that after the temperature equalization Greater dimensional coverage between the collar and the outer bearing ring is present, which also creates a game fit or transition fit realizable with the help of the recording according to the invention is. When mounting the rolling bearing on a shaft, it can turn out to be particularly useful when the temperature the shaft is lower than that of the bearing. Here too a larger one, according to what was described above achieve dimensional coverage or a press fit realize.

For some types of storage, such as the Execution of the rolling bearing as a full spherical bearing, it can turn out to be useful when filling the warehouse with balls one of the rings is blown up when the rolling bearing but in the assembly that brings it together with its seat, is not disassembled and essentially closed. The In any case, assembly is carried out using elastic Deformation of at least one of the parts to be joined.  

A particularly advantageous application can find the recording according to the invention in a roller bearing which is the pilot bearing of a transmission input shaft. Likewise, a shaft can be accommodated in the bearing 5 , which can be connected to a transmission input shaft and thus represents an intermediate shaft, as is used, for example, in the transaxle design of motor vehicles. The receptacle according to the invention can be realized in a particularly advantageous manner if the pilot bearing or guide bearing is part of a dual-mass flywheel. According to a further preferred embodiment, the roller bearing, which is held in the receptacle according to the invention, can form the bearing of the two flywheel masses to one another in a dual-mass flywheel.

The configuration according to the invention is shown in the figures Recording for the radially fixed mounting of a rolling bearing on Example of one integrated in a dual mass flywheel Pilot bearing shown for a transmission input shaft.

Here, FIG. 1 shows a dual-mass flywheel in section,

Fig. 2 shows an enlarged detail of the pilot bearing receptacle,

Fig. 3 is a further enlarged detail of a portion of the pilot bearing support.

The dual mass flywheel 1 shown in FIG. 1 is divided into two flywheel elements 2 and 3. The flywheel element 2 can be fastened on a crankshaft (not shown) of an internal combustion engine via the bores 4 with the aid of fastening screws. With the help of fastening supply thread 5 , a switchable friction clutch, not shown, can be screwed onto the second flywheel element 3 . Between the flywheel element 2 and the flywheel element 3 , a device for damping torsional vibrations is provided, which enables a relative rotation between the two flywheel elements 2 and 3 . The two flywheel elements 2 and 3 are rotatably positioned coaxially to one another via a bearing 6 .

The flywheel element 2 , which is the input part of the damping device 7 , forms a housing which delimits an annular chamber 8 in the circumferential direction, in which part of the damping device, in this case arc-shaped helical spring sets 9 , is received.

The flywheel element 2 , which has the annular chamber 8 , consists essentially of two housing parts 10 , 11 which are radially tightly connected to one another. The output part for the part of the damping device 7 received in the annular chamber S is formed by a radial flange 12 which is arranged axially between the two housing parts 10 , 11 made of sheet metal. The flange 12 has on its outer circumference radial arms 13 which form areas of application for the coil spring sets 9 . The support areas for the arcuate coil spring sets 9 are formed by axial impressions 14 , 15 in the housing parts 10 , 11 . In the example shown, the housing part 10 has on its outer circumference a donor ring gear 16 for engine management and the housing part 11 on its outer circumference the starter ring gear 17 .

In the interior of the annular chamber 8 , which is at least partially filled with pasty medium, such as fat, shell bodies 18 are provided radially on the outside as wear protection, on which the arcuate coil spring sets 9 can be supported at least under centrifugal force. The inner parts of the shell bodies 18 are at least substantially matched to the outer contour of the coil springs 9 and partially encompass them.

The flange 12 has recesses 19 lying radially further inward, which form areas of application for further spring sets 20 , as a result of which the flange 12 represents the input part of this part of the damping device 7 . The radially inner spring sets 20 are arranged in spring windows 21 , 22 of the side windows 23 , 24 and are supported in the circumferential direction on the edge regions of these spring windows 21 , 22 . The side windows 23 , 24 are axially spaced on both sides of the radial flange 12 and axially and non-rotatably connected to the secondary side flywheel element 3 via rivet elements 25 . Between the side window 24 and the secondary-side flywheel element 3 , the radially inner region of a sealing membrane 26 is clamped, the radially outer region of which rests axially resiliently on the radially inner region of the housing part 11 and thus ensures the sealing of the annular chamber 8 from the outside.

A friction device 27 is provided radially inside the rivet elements 25 , which comes into operation when the two flywheel elements 2 , 3 are rotated relative to one another. The friction elements can be controlled so that they are effective from the start of the relative rotation, as well as so that they are only used after a certain clearance angle.

The bearing 6 is provided with sealing caps 28 , 29 , which can also be used for thermal insulation of the rolling bearing. The inner ring of the bearing 6 is secured until the assembly of the two-mass flywheel 1 on the crankshaft of an internal combustion engine by means of a disk 30 , which is fastened via a pin connection 31 to the hub 32 of the flywheel element 2 .

The cast in the embodiment, for. B. cast iron, manufactured hub 32 carries in its inner area on its side facing away from the internal combustion engine in an axially extending extension or sleeve-shaped area 33, the pilot bearing or guide bearing 34 , which forms a support for a transmission input shaft and in the manner according to the Invention within the axial approach 33 is supported. In the example shown, this pilot or inner bearing 34 is arranged in approximately the same axial position as the secondary-side flywheel element 3 .

The mounting of the bearing 34 according to the invention is described in more detail below with reference to the enlarged representations in FIGS. 2 and 3, with FIG. 3 showing a further enlarged representation of the area marked "X" in FIG. 2.

The axial extension 33 is the hub 32, as can be seen from the figures, viewed in the axial direction, divided into different inner diameter sections, all of which are integrally formed with the hub 32 and with their axial approach 33rd

The smallest diameter has the first inner diameter area 35 , which has on its side facing the bearing 34 a radially extending portion on which the outer ring of the bearing 34 can be axially supported, whereby with this diameter area 35 a trained in a conventional manner axial Bearing stop is formed.

The second inner diameter area 36 is the area with the largest inner diameter within the axial shoulder 33 of the hub 32 , forms the bearing seat for the bearing 34 and is matched to the outer diameter of the outer ring of the bearing 34 according to the load case or according to the selected tolerance field.

The third inner diameter region 37 has a smaller diameter than the bearing seat 36 , as a result of which a second form-fitting axial securing region or axial stop for the bearing 34 , which is produced in one piece with the axial extension of the hub 32 , is formed. In this inner diameter area 37 , which is limited in FIGS . 2 and 3 in the axial direction by the dashed line 39 and the solid line 40 , the dimensional coverage of the axial extension 33 of the hub 32 and the outer ring of the roller bearing 34 is greater than in the area of Bearing seat, that is, the inner diameter region 36 , which results in a higher pressure when mounting the bearing 34 in the axial extension 33 , which causes an elastic deformation of the parts to be joined.

The inner diameter region 36 forms a groove-like bearing seat, so that the bearing 34 is arranged in an undercut in the assembled state. The axially of the positive bearing lock 37 according to the invention on the side facing away from the bearing 34 upstream conical surface 38 serves as a mounting or threading bevel for the bearing 34th

In the region of the radially inwardly projecting collar 37 , the axial extension 33 of the hub 32 is provided with an area of reduced wall thickness 41 . This area of reduced wall thickness 41 lies essentially on the side of the roller bearing 34 facing away from the axial stop 35 and in this case is formed by the reduced outside diameter area 42 .

From Fig. 2 it can be seen that the diameter in the reduced th outer diameter region 42 is considerably smaller than the outer diameter of the outer diameter region 43 , which is located axially at the height of the inner diameter region 36 , that is, the bearing seat.

This area of reduced wall thickness 41 achieves greater elasticity of the axial extension 33 , especially in the axial area of the inner diameter 37 , which can be dimensioned such that the parts, namely the hub 32 and the bearing 34, also at room temperature or with the same temperatures can be added, after the joining, ie when the bearing is in its groove-like seat in the area of the inner diameter 36 , a mechanical positive axial securing of the bearing 34 in the area of the inner diameter area 37 is given. However, it is also possible to mount the bearing 34 and the hub 32 with a temperature difference, as a result of which, for example, a greater dimensional coverage of the inner diameter region 37 and the outer diameter of the bearing outer ring can be achieved. This increased overlap results in an even increased axial fuse, so that the bearing can also be designed as a floating bearing, for example.

The roller bearing 34 can also be designed as a full-spherical bearing, for example to increase the load rating or increase the service life. If, in such a bearing, a ring for filling the bearing with balls is blown, that is to say divided in the axial direction, it may prove expedient if the bearing ring is left undivided, which cooperates with the fastening device or bearing securing device 37 according to the invention.

The invention is not illustrated and described on the NEN embodiments limited, but also includes Variants, in particular by combining individual, in connection with the different embodiments described features or elements are formed can. Furthermore, individual, in connection with the in the embodiments shown in the figures Features or modes of operation taken on their own represent independent invention.

Claims (12)

1. Recording for radially fixed mounting of a rolling bearing on one of its rings on an at least substantially union over the axial extent of the same extending seat and at the end regions of the seat provided radial projections for axially fixing the bearing, the bearing from one side axially its seat can be brought together, characterized in that at least the projection facing the mounting side is a collar which is formed in one piece with the seat and is elastically deformable when the bearing is assembled. 2. Recording according to claim 1, characterized in that the the projection opposite direction of assembly is dimensioned such that it is insurmountable in the axial direction represents an obstacle to the camp. 3. Recording according to claim 1, characterized in that the Confederation has a closed configuration.   4. Recording according to one of claims 1 to 3, characterized characterized in that the outer ring in a sleeve-like Area is recorded and that the axially projecting Area at least over the axial extent of the federal government is weakened. 5. Admission after at least one of the previous ones Claims, characterized in that the bearing seat for the outer ring is designed as a back stitch. 6. Admission after at least one of the previous ones Claims, characterized in that the sleeve-like Area has an introductory slope. 7. Recording according to one of claims 1 to 6, characterized characterized in that for mounting the rolling bearing in a Bore at least the collar a higher temperature exhibits than the camp. 8. Recording according to one of claims 1 to 7, characterized characterized in that for mounting the rolling bearing on a Wave the temperature of the latter is lower than that of the camp. 9. Admission after at least one of the previous ones Claims, characterized in that for filling the Bearing with balls one of the rings is blown up  Rolling bearings but not disassembled during assembly and in is essentially closed. 10. Recording according to one of claims 1 to 9, characterized characterized in that the rolling bearing is the pilot bearing one Transmission input shaft is. 11. Recording according to claim 10, characterized in that the pilot bearing is part of a dual mass flywheel is. 12. Recording according to one of claims 1 to 11, characterized characterized in that the rolling bearing the storage of the two Flywheels in a dual mass flywheel to each other forms.