EP1721708B1 - Assembly device for pressing in a wheel hub bearing with a pull rod - Google Patents

Description

The invention relates to a device for retracting a wheel bearing in a bearing bore of a bearing housing of an axle body of a motor vehicle consisting of a pull spindle with pull nut, a pressure piece and a support body, wherein the pull spindle during Einziehvorgang the pressure piece, the wheel bearing and the support body extends axially and the pressure piece on Outer ring of the wheel bearing and the support body is attached to the bearing housing concentric with the bearing bore.

Devices of the generic type are for example from the DE 35 30 983 C1 as well as the DE 37 30 017 C1 known. Such devices are used, for example, for retracting wheel bearings. These devices have in common that a pressure piece is provided for pulling, which is attachable to the outer ring of a wheel bearing to be recovered. Furthermore, such devices have a support body, which is attachable to the bearing housing concentric to its longitudinal center axis. For retracting the wheel bearing, a pull spindle may be provided with a pull nut, wherein the pull spindle axially projects through the pressure piece, the wheel bearing to be retracted and the support body during the pulling-in process. That is, for retraction of the support body on one side of the bearing housing at this concentric with the bearing bore of the bearing housing is arranged to extend and has a corresponding central through hole for the implementation of the tension spindle. The wheel bearing is set on the opposite side of the bearing body of the bearing housing on this, wherein the tension spindle also extends axially through this wheel bearing. The pressure piece, which is adapted in its diameter to the outer diameter of the wheel bearing, is now placed on the front side of the wheel bearing, whereby this pressure piece is axially penetrated by the tensioning spindle. Subsequently, the tension nut is screwed onto the pulling spindle and presses against the pressure piece during the pulling-in process. Due to the engagement of the tension spindle with the support body, the wheel bearing is now drawn into the bearing bore of the bearing housing with further tightening of the tension nut.

Solutions are also known in which a hydraulic cylinder is provided with a tension spindle, which is correspondingly hydraulically movable axially and is retracted by activation of the hydraulic cylinder corresponding to the wheel bearing on the pressure piece in the bearing bore of the bearing housing.

Usually, in particular, the support body is concentric with the bearing bore on the position housing attachable, so that substantially a concentric orientation of the tensioning spindle is effected during the insertion process.

There are also applications known in which the bearing bore of the bearing housing is sharp-edged or insufficiently deburred. Such a sharp-edged design of the bearing bore is particularly noted in bearing housings, in the bearing bore the wheel bearing is not secured with a locking ring, but is held purely only by the press connection during use. That is, in these cases, a very tight interference fit between the wheel bearing and the bearing bore is provided, so that the wheel bearing has a correspondingly large oversize compared to the bearing bore and is correspondingly difficult to retract. In the cases mentioned, an oblique attachment of the wheel bearing to the bearing bore is frequently observed, so that the wheel bearing is drawn in obliquely at least at the beginning of the insertion process or tilted on the bearing housing. On the one hand, this leads to increased pull-in forces and, on the other hand, to damage of the bearing housing or of the wheel bearing.

Accordingly, the invention has the object, a device of the generic type in such a way that such tilting is at least at the beginning of the Einziehvorgangs safely excluded.

The object is achieved in that the support body has a guide cylinder on which the wheel bearing is guided sliding during Einziehvorgang.

The embodiment of the invention provides a device by means of which a wheel bearing concentric to the bearing bore of the bearing housing can be drawn into this without tilting of the bearing housing can occur especially at the beginning of Einziehvorgangs. In this case, the smallest possible clearance is provided between the guide cylinder and the wheel bearing or the inner ring of the wheel bearing, so that the wheel bearing safely concentric and coaxial with the bearing bore of the bearing housing is guided. By this configuration, a kind of positive guidance of the wheel bearing is achieved and thus ensures that the wheel bearing can not tilt in its attached at the beginning of the Einziehvorgangs state, whereby damage to the wheel bearing or the bearing housing in the bearing bore can be reliably prevented.

Furthermore, it can be provided according to claim 2 that the guide cylinder has an axial length which corresponds to at least 1.5 times the axial length of the wheel bearing. By this configuration it is ensured that the wheel bearing is at least a part of its axial length at the beginning of the Einziehvorgangs with the guide cylinder engaged and thus a corresponding coaxial alignment is ensured safe.

For a further improvement of the leadership of the wheel bearing on the guide cylinder of the support body may be provided according to claim 3, that the guide cylinder in the attached to the bearing housing state of the wheel bearing the wheel bearing and the bearing housing extends completely axially. This means that at the beginning of the Einziehvorgangs the wheel bearing is completely guided axially displaceable with its entire axial length on the guide cylinder.

Further, it can be provided according to claim 4, that the pressure piece, through which the wheel bearing is retracted into the bearing bore of the bearing housing forms a pressure cylinder whose outer diameter is smaller than the outer diameter of the wheel bearing and that further the pressure cylinder has an axial length, at least is as large as the difference between the axial length of the bearing housing and the axial length of the guide cylinder. At one is ensured by the configuration of the outer diameter of the pressure piece that a wheel bearing is also retractable in a bearing housing retractable. Accordingly, its outer diameter is preferably formed slightly smaller than the outer diameter of the wheel bearing and thus also as the inner diameter of the bearing bore, in which the wheel bearing is to be fed. The defined axial length of the printing cylinder ensures that the drawing-in process can be carried out completely. In other words, this means that the axial length of the pressure cylinder is at least as large as the axial length of the axially projecting from the wheel bearing part of the guide cylinder after the pulling operation. This ensures that the pressure piece can not collide with the guide cylinder and the guide cylinder is thus completely absorbed by its axially projecting part of the pressure cylinder of the pressure piece.

According to claim 5, the support body may have a central receiving thread, in which either a piece adapter or a hydraulic cylinder can be used. By means of this embodiment of the support body, on the one hand, as is known from the prior art, a normal tension spindle with a pull nut can be used, in which case the pulling-in process is effected by tightening the tension nut or the tension spindle. In the case of extremely high pull-in forces, however, a hydraulic cylinder may alternatively be provided which can be brought into engagement with the support body in an exchangeable manner against the support adapter is. Such hydraulic cylinders have a kind of pull spindle, which also protrude axially in the attached state, the bearing housing, the wheel bearing and the pressure piece. On the outstanding from the pressure piece end of the tension spindle turn a nut can be screwed and placed on the pressure piece by axial adjustment to the plant. By subsequently activating the hydraulic cylinder, the pulling spindle is pulled in the pulling-in direction so that the wheel bearing is automatically drawn into the bearing bore of the bearing housing via the tension nut and the pressure piece.

According to claim 6 it can further be provided that the support adapter for the axial passage of the tension spindle has a through hole which is provided for receiving a Axialdrucklagers for axially supporting the tension spindle with a radially enlarged recess. This configuration ensures a concentric alignment of the tension spindle in the support adapter and thus also relative to the bearing bore of the bearing housing. As a result of this configuration, furthermore, the coaxial alignment of the wheel bearing during the pulling-in process is further improved. The thrust bearing serves to reduce the friction, whereby the rotational forces on the tractor spindle when tightening are significantly reduced, especially at higher axial forces.

For the most precise alignment of the support body and the embodiment according to claim 7, according to which the support body is provided with a spigot, with which the support body centered on the bearing bore of the bearing housing and coaxially aligned can be used.

According to claim 8 may further be provided that the guide cylinder and the support body are integrally formed. Such a configuration is extremely inexpensive to produce.

Alternatively to the embodiment according to claim 8 may be provided according to claim 9, that the guide cylinder and the support body are formed as separate components. In this case, a plurality of guide cylinder and support body of different dimensions may be provided according to claim 9, which are selectively coupled with each other. As a result of this embodiment, the device according to the invention can be used extremely variably and can accordingly be adapted in a simple manner to differently dimensioned bearing housings and wheel bearings.

Alternatively or in addition to the embodiment according to claim 6 concerning the thrust bearing can be provided according to claim 10, that the pressure piece for axial support of the tension nut is provided with a thrust bearing. By this configuration, the wheel bearing is retractable by tightening the pull nut or by selectively tightening the pull spindle or the pull nut in the position bore of the bearing housing, whereby the operability is improved in tight spatial conditions.

Fig. 1

eine erste Ausführungsform eines Stützkörpers mit Führungszylinder im Vertikalschnitt;

Fig. 2

eine zweite Ausführungsform eines Stützkörpers mit Führungszylinder, welche zweiteilig ausgebildet sind im Vertikalschnitt;

Fig. 3

den Stützkörper mit seinem Führungszylinder aus Fig. 1 im Einsatz zu Beginn des Einziehvorgangs eines Radlagers im Vertikalschnitt;

Fig. 4

die Darstellung aus Fig. 3 am Ende des Einziehvorgangs.

Reference to the drawing, the invention is explained in more detail by way of example in the following. It shows:

Fig. 1

a first embodiment of a support body with guide cylinder in vertical section;

Fig. 2

a second embodiment of a support body with guide cylinder, which are formed in two parts in vertical section;

Fig. 3

the support body with its guide cylinder Fig. 1 in use at the beginning of the threading process of a wheel bearing in vertical section;

Fig. 4

the presentation Fig. 3 at the end of the pulling process.

Fig. 1 shows a vertical section through a support body 1 according to the invention, to which a guide cylinder 2 is integrally formed. This guide cylinder 2 is adapted in its diameter to the inner diameter of an inner ring 22 of a wheel bearing 11 such that the wheel bearing 11 is axially slidably received with this inner ring 22 with the least possible play on the guide cylinder 2, in particular from the Fig. 3 and 4 evident.

Furthermore, it is off Fig. 1 it can be seen that the support body 1 has a substantially larger diameter than the guide cylinder 2. In this case, the support body 1 is also cylindrical and has the guide cylinder 2 towards a radially tapered spigot 3, with which the support body 1 is concentric with a bearing bore 19 of a bearing housing 20 can be used, as also in the Fig. 3 and 4 is shown by way of example.

Furthermore, it is off Fig. 1 it can be seen that the guide cylinder 2 has a central through-hole 4, which opens into the support body 1 and is provided in use for the passage of a tension spindle 13 ( Fig. 3 and 4 ).

In the region of the support body 1, a radially expanded portion is provided with a receiving thread 5 subsequent to the through hole 4, which for selectively receiving a support adapter 12 (FIG. Fig. 3 and 4 ) or a hydraulic cylinder is used. Furthermore, the guide cylinder 2 is provided in its opposite end portion of the support body 1 with a centering cone 6, by which the sliding of the wheel bearing 11 is facilitated on the guide cylinder 2.

Fig. 2 shows a second embodiment of a support body 1/1, which is formed in this embodiment as a separate component. This support body 1/1 also has a centering lug 3, which also serves for the concentric attachment of the support body 1 to a bearing bore 19 of a bearing housing 20. Furthermore, the support body 1/1 is also provided with a receiving thread 5, in which optionally the support adapter 12 from Fig. 3 and 4 or a hydraulic cylinder can be screwed.

In its this receiving thread 5 opposite end portion, the support body 1/1 has a second coaxial with the receiving thread 5 extending internal thread 7, in which a separate guide cylinder 2/1 is screwed with a corresponding external thread 8. This external thread 8 is formed smaller in its outer diameter than the outer diameter of the guide cylinder 2/1, so that the guide cylinder 2/1 to the support body 1/1 towards a flat, annular shoulder 9 forms. By this paragraph 9 and by the internal thread 7 in conjunction with the external thread 8 of the guide cylinder is 2/1 with its through hole 4 concentric with the longitudinal center axis 10 of the support body 1/1 and coaxial with the support body 1/1 at this fixed and replaceable mountable, as in Fig. 2 is shown.

Fig. 3 and 4 each show a vertical section of the support body 1 with its guide cylinder 2 Fig. 1 in use. It is in Fig. 3 the beginning and in Fig. 4 the end of the Einziehvorgangs a wheel bearing 11 exemplified.

It can be seen that in the receiving thread 5 in the embodiment of Fig. 3 and 4 a support adapter 12 is screwed. This support adapter 12 is used for concentrically receiving a traction spindle 13, to which the support adapter 12 is provided in a corresponding central through-bore 14. This through hole 14 is provided in its outer end region with a radially enlarged recess 15, in which the tension spindle 13 is received with a radially expanded, circumferential support bar 16 fitting. In the area of this support bar 16, the traction spindle 13 has on the outside a drive hexagon 17, via which the traction spindle 13 can be rotationally fixed during the pulling-in process of the wheel bearing 11.

Next, an axial thrust bearing 36 is provided for axial support of the tension spindle 13 with its support bar 16 in the recess 5, which is secured in the recess 15 by a securing ring 36.

How out Fig. 3 can be seen, the pull spindle 13 extends through the through hole 4 both of the support body 1 and the guide cylinder 2 completely in the axial direction. The support body 1 is inserted with its centering projection 3 in a radially inwardly directed, circumferential stop web 18 of a bearing bore 19 of a bearing housing 20, so that the support body 1 together and the guide cylinder 2 aligned with its common longitudinal central axis 10 coaxial with the bearing bore 19 of the bearing housing 20 are. The bearing bore 19 is used in operation for receiving the wheel bearing 11, which at the beginning of the drawing process the support body 1 opposite to the bearing housing 20 and the bearing bore 19 is attached to its outer bearing ring 21.

Furthermore, it is off Fig. 3 recognizable that in this attached to the bearing housing 20 state of the support body 1 of the guide cylinder 2, the bearing housing 20 extends completely axially and projects into the inner ring 22 of the wheel bearing 11. In the present embodiment, while the length of the guide cylinder 2 is formed such that the wheel bearing 11 is fully penetrated this attached state on the bearing housing 20 from the guide cylinder 2.

Next is out Fig. 3 It can be seen that the inner ring 22 is fitted to fit the guide cylinder 2, wherein only an extremely small clearance can be provided between the inner ring 22 of the wheel bearing 11 and the guide cylinder 2. As a result of this embodiment, as is clear Fig. 3 it can be seen, the entire wheel bearing 11 concentric with the longitudinal central axis 10 of the support body 1 and so that at the same time concentric with the bearing bore 19 'and aligned coaxially to this running.

For retracting the wheel bearing 11 in the bearing bore 19, a pressure piece 23 is provided in the present embodiment, which has a wheel bearing 11 directed towards the pressure cylinder 24 whose inner diameter corresponds approximately to the outer diameter of the guide cylinder 2. Thus, the guide cylinder 2 is fitting inserted into the printing cylinder 24 during the Einziehvorgangs. For the axial support of the pressure cylinder 24 on the outer ring 21 of the wheel bearing 11, the pressure cylinder 24 in the present embodiment has an axially projecting, circumferential pressure ridge 25. By this axially projecting pressure bar 25, a clearance 37 is formed between the wheel bearing 11, in particular its inner ring 22, and the pressure cylinder 24. This is certainly excluded that when pulling the pressure cylinder 24 against the inner ring 22 of the wheel bearing 11 or a frontally mounted bearing seal (not shown in the drawing) of the wheel bearing 11 presses, so that damage to the wheel bearing 11 or the seal is safely excluded.

Furthermore, it can be seen from the drawing that the tension spindle 13 also completely projects through the pressure piece 23 with a corresponding threaded portion 26 on which a pull nut 27 is screwed on the outside. This pull nut 27 is received concentrically in an outside recess 28 of a through hole 29 of the pressure piece 23. Alternatively to the thrust bearing of the support adapter 12 or in addition thereto, the depression 28, be provided with an appropriately dimensioned design, with a thrust bearing. As a result, a variable operability of the device is achieved.

It can be seen that in this attached state, the wheel bearing 11 is aligned concentrically and coaxially with the bearing bore 19 of the bearing housing 20 and is axially displaceably guided in this position by the guide cylinder 2. In order for a tilting at the beginning of the insertion process of the wheel bearing 11 relative to the bearing housing 20 and its bearing bore 19 and also during the entire Einziehvorganges safely excluded.

It is easy to imagine that in the illustrated embodiment by tightening the pull spindle 13 via the drive hexagon 17 and simultaneous "holding" or locking the pull nut 27, the wheel bearing 11 is pressed in the direction of arrow 30 via the thrust piece 23 in the bearing bore 19 of the bearing housing 20 and . is retracted. Is in the recess 28 of the pressure member 23 also or alternatively provided a thrust bearing, it can be used to retract the wheel bearing 11 and the tension nut 27.

The finished retracted or pressed state shows Fig. 4 in vertical section. It can be seen that in the embodiment of the illustrated bearing housing 20, the wheel bearing 11 is pressed in this fully retracted state up to a radially inwardly projecting stop bar 18 of the bearing bore 19. It can also be seen that the part of the guide cylinder 2 projecting axially from the bearing housing 20 to the right is completely in the Pressure piece 23 and the pressure cylinder 24 is received.

The axial length of the printing cylinder 24 corresponds to at least the difference in length between the axial length of the guide cylinder 2 and the axial length of the bearing housing 20, so that a complete retraction of the wheel bearing 11 in the bearing housing 20 and its bearing bore 19 is safely carried out without the Guide cylinder 2 can collide with the pressure piece 23, as is made Fig. 4 is apparent.

If larger forces are necessary when pulling in, then the support adapter 12 can be removed together with the pulling spindle 13 and, instead, a hydraulic cylinder can be inserted into the receiving thread 5 of the supporting body 1. Such hydraulic cylinders are generally known from the prior art and are designed for such tasks usually as a so-called hollow piston cylinder. Such hollow piston cylinders have a kind of traction spindle, which are arranged axially adjustable in the pressure piston of the hydraulic cylinder via a corresponding threaded connection. Accordingly, the hydraulic cylinder with its traction spindle, as in Fig. 3 and 4 shown for the tension spindle 13, are completely inserted through the support body 1 and the guide cylinder 2, in which case also the tension nut 27 can be screwed onto the then protruding from the pressure piece 24 end of this tension spindle of the hydraulic cylinder. This pull nut 27 will then, as in Fig. 3 shown for the tension spindle 13, brought outside in the recess 28 of the pressure piece 23 to the plant. By subsequently activating the hydraulic cylinder is then pulled the pulling spindle in the direction of arrow 30, whereby the wheel bearing 11 is retracted into the bearing housing 20 by the pressure member 23 also used.

It can be seen that due to the special design of the support body 1 and the support body 1/1 from the Fig. 1 and 2 , An absolutely coaxial, tilt-free insertion of a wheel bearing 11 in the bearing bore 19 of a bearing housing 20 can be performed. In this case, the wheel bearing 11 is guided over its inner bearing ring 22 absolutely concentric and coaxial with the bearing bore 19 of the bearing housing 20, so that tilting is safely excluded.

Claims (10)

1. Device for inserting a wheel bearing (11) into a bearing bore (19) of a bearing housing (20) of an axial body of a motor vehicle consisting of a feed rod (13) with a tension nut (27), a pressure piece (23) and a support body (1, 1/1), wherein the feed rod (13) during the insertion procedure passes axially through the pressure piece (23), the wheel bearing (11) and the support body (1,1/1), and the pressure piece (23) is fitted onto the outer ring (21) of the wheel bearing (11) and the support body (1, 1/1) is fitted onto the bearing housing (20) concentrically to the bearing bore (19),
   characterised in that
   the support body (1, 1/1) comprises a guiding cylinder (2, 2/1), on which the wheel bearing (11) is guided in a sliding manner during the insertion procedure.
2. Device according to claim 1, characterised in that the guiding cylinder (2, 2/1) has an axial length, which corresponds to at least 1.5 times the axial length of the wheel bearing (11).
3. Device according to claim 1 or 2, characterised in that the guiding cylinder (2, 2/1) in the position of the support body (1, 1/1) fitted on the bearing housing (20) passes axially completely through the bearing housing (20) and the wheel bearing (11).
4. Device according to claim 1, 2 or 3, characterised in that the pressure piece (23) forms a pressure cylinder (24), the outer diameter of which is smaller than the outer diameter of the wheel bearing (11), and in that the pressure cylinder (24) has an axial length which is at least as large as the length difference between the axial length of the bearing housing (20) and the axial length of the guiding cylinder (2, 2/1).
5. Device according to any one of claims 1 to 4, characterised in that the support body (1, 1/1) comprises a central mounting thread (5), into which optionally a support adapter (12) or a hydraulic cylinder can be inserted.
6. Device according to claim 5, characterised in that the support adapter (12) for the axial feeding of the feed rod (13) comprises a through bore (14), which is provided for mounting an axial pressure bearing (35) for the axial support of the feed rod (13) with a radially expanded depression (15).
7. Device according to any one of claims 1 to 6, characterised in that the support body (1, 1/1) has a centring shoulder (3), by means of which the support body (1, 1/1) can be centred on the bearing bore (19) of the bearing housing (20).
8. Device according to any one of claims 1 to 7, characterised in that the guiding cylinder (2) and the support body (1) are designed in one piece.
9. Device according to any one of claims 1 to 7, characterised in that the guiding cylinder (2/1) and the support body (1/1) are designed as separate components, and in that several guiding cylinders and support bodies of different dimensions are provided, which can be coupled to one another optionally.
10. Device according to any one of claims 1 to 9, characterised in that the pressure piece (23) is provided for the axial support of the tension nuts (27) with an axial pressure bearing.

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