DE3306267A1 - DEVICE FOR AUTOMATICALLY SETTING UP IN PARTICULAR BEARINGS OF A SLIDING OR ROLLER BEARING FOR A DRIVEN SHAFT - Google Patents

Description

Device £ um_ £ el_b £ ^ ätJ _: g_en_An £ t ^ el_l ^ en from gaarweUe against each other_angest ^ lten angular contact bearings of a sliding or whale bearing for a driven shaft

The present invention relates to a device for the automatic adjustment of mutually adjusted pairs Angular contact bearings of a plain or roller bearing for a driven shaft according to the preamble of the claim 1.

In a known device of the type mentioned, the force controlled by the torque for the axial displacement of a power transmission element generated, which over an internal thread with a corresponding mating thread of the Shaft is connected (DE-PS 26 30 035). In this known device, the torque of the power transmission element of the thread pitch of the power transmission element only in one direction of rotation

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With the features of claim 2 is a compact one Device created which prevents the rolling elements in the event of temporary relief or when changing slide in the direction of rotation on the outer flat face of the axially displaceable bearing ring without load. When the load is released, the elastic coupling ring presses against the rolling elements via the axially displaceable bearing ring, so that this is always loaded axially and thus a coupling connection between the load transfer element and produce the axially displaceable bearing ring.

Claim 3 characterizes another device which is also particularly compact. Here are the rolling bodies Installed between the two angular contact bearings and thus against the ingress of dirt or damage from the outside protected.

The additional embodiment according to claim 4 includes a structural simplification of the device.

With the development of the device according to claim 5 it is achieved that the rolling elements make linear contact with the inclined contact surfaces of their recess have, so that they have a relatively high force without the risk of overloading between the power transmission element and the coupling element can be transmitted.

The design of the device according to claim 6 has the consequence that the load transfer element on the pin the shaft is guided centrally and can perform small rotary movements relative to the shaft, which by Displacement of the rolling elements in their depressions during operation can be caused.

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be transferred to the shaft. In addition, the known device takes up a relatively large installation space in the axial direction, which in some applications is not available.

The invention characterized in claim 1 is based on the object of providing a device of the specified type to create an automatic adjustment of the two angular contact bearings that is dependent on the magnitude of the torque is also effected when the torque changes its direction of rotation. The device should also have a take up relatively little space.

With the device of the invention it is achieved that the both angular contact bearings always a sufficiently large one, even with changing direction of rotation, due to the corresponding force receive automatically controlled mutual preload for axial displacement. With small torque loads the two angular contact bearings are loaded relatively low by the preload, so that the angular contact bearings are advantageous have small bearing friction. On the other hand, the two angular contact bearings are thrown through with high torque loads loaded with a high preload. This high preload prevents the bearing rings of the two angular contact bearings as a result high radial and axial forces, e.g. B. tooth forces of gears, mutually shifted, which gives rise to Bearing noise and undesirable displacement the shaft can be in the two angular contact bearings.

Advantageous developments of the invention are in the Characterized subclaims.

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The configuration according to claim 7 prevents that the shaft or the output members connected to it are overloaded by an impermissibly high torque and be damaged accordingly. The spring element, which is relatively stiff in relation to the spring force of the coupling ring, e.g., disc spring, causes the power transmission element due to the correspondingly high force for axial displacement against the force of the spring element axially relocated and moved away from the outer face of the element acting as a coupling axially displaceable bearing ring will. The rolling elements then emerge from their associated recess in the end face of the power transmission element and thus automatically release the non-rotatable connection between the driving power transmission element and the axially displaceable bearing ring of the angular contact bearing concerned.

The additional refinements according to claim 8, 9 and 10 contain further structural simplifications of the device.

The device according to the invention for automatic starting of angular contact bearings of a plain or roller bearing for a driven one, which are set against one another in pairs Shaft is used in the following description of two exemplary embodiments explained in more detail with the drawings.

Show it:

1 shows a longitudinal section through a bearing of a shaft carrying a conical gear wheel,

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Fig. 2 is a longitudinal section through the shown in Fig. 1, between the axially displaceable Bearing ring and a shoulder of the shaft built-in, resiliently compressible coupling ring,

Fig. 3 shows a cross section along the line A-A through the coupling ring shown in Fig. 2,

Fig. 4 is a plan view of the one with axial depressions for the roller body provided inner end face of the power output shown in Fig. 1

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FIG. 5 shows a longitudinal section along the line B-B through the power transmission element shown in FIG. 4, FIG.

Figure 6 is a partial sectional view of the power supply tragungsel ementes along the line C-C in Fig. 5 and

7 shows a longitudinal section through a modified mounting of a shaft carrying an external toothing.

With 1 in Fig. 1 is a housing and with 2 and 3 are the two angular contact bearings of a roller bearing called. In the present case, both angular contact bearings 2, 3 are single-row Tapered roller bearings are formed, each of which has an inner bearing ring 4,5, an outer bearing ring 6,7 and dazwisehen have arranged tapered rollers 8. The lines of action of force 9, 10 of this paired against each other Angular contact bearings 2, 3 run radially behind one another

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outside merging. The two outer bearing rings 6, 7 are thereby inserted into the bore of the housing 1 radially inwardly projecting annular rim 11 held and supported at a certain axial distance from one another.

The driven shaft 12 is mounted in the two angular contact bearings 2, 3. The shaft 12 carries 13 fixed The inner bearing ring 5 of the output-side angular contact bearing 5, which is supported against a shoulder surface 14 of the shaft 12 outwardly is press-fitted on the outer surface _t of the shaft 12 at its abtriebsei term end a conical gear. The inner bearing ring 4 of the drive-side angular contact bearing 2, on the other hand, is held with a sliding fit on the outer surface of the shaft 12. This can therefore be axially displaced with respect to the inner bearing ring 5 of the angular contact bearing on the output side and also execute small relative movements on the shaft 12.

Between the two inner rings 4.5 there is an axially resilient compressible one. Coupling ring 15, which is made of spring steel can be made, arranged. This coupling ring 15 is supported on the drive side tig on the face of the axially displaceable bearing ring 4 facing it and on the output side on the shoulder surface 16 of a radial shoulder the shaft 12 from (Fig. 2). The coupling ring 15 has its two axial ends arranged on the circumference, axially protruding retaining lugs 17,18, which in corresponding axial recesses in the end face of the bearing ring 4 or the shoulder surface 16 lock in a form-fitting manner (Fig. 3). on in this way, the coupling ring 15 is at its drive-side end with the axially displaceable inner bearing ring 4 and at its output end with the shaft non-rotatably connected.

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This is ring-shaped on the drive-side journal of the shaft 12 trained power transmission element 19 placed and held rotatably. By means of a shaft nut 20 and a spring element 21, which in the present case is designed as a plate spring, is the Power transmission element 19 secured against being pulled off the shaft 12. The power transmission element has on its circumference 19 has four axially continuous threaded holes 22 (FIGS. 4 and 5). By screws 23, which are screwed into these threaded holes 22 is the flange of a drive unit 24 with the power transmission element 19 firmly connected. A torque can thus be transmitted from the drive unit to the power transmission element 19 are transferred.

On the outer surface of a shoulder of the power transmission element 19 slides a fixed in the housing 1 Sealing ring 25.

Between the outer flat end face 26 of the axially displaceable bearing ring 4 and the output-side, this axially and parallel opposite planar end face 27 of the power transmission element 19 four cylindrical roller bodies 28 are arranged evenly distributed around the circumference. The axes of rotation of these rolling bodies 28 run in the radial direction. As can be seen particularly clearly in FIGS. 5 and 6, the rolling bodies 28 are (shown in dash-dotted lines) each in one with one inclined contact surface 29 in one direction of rotation and with an inclined opposite contact surface 30 provided in the opposite other direction of rotation Recess 31 held in the end face 27. In the present embodiment, the rolling body 28, which are installed between the end face 27 and the end face 26, one for the torque transmission

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Establish the necessary clamp connection by inserting it in one direction of rotation against the inclined contact surfaces 29 or run against the inclined contact surfaces 30 in the other direction of rotation. There is a torque from the power transmission element 19 via the rolling elements 2 8 onto the axially displaceable inner bearing ring 4 and from the inner bearing ring 4 via the coupling ring 15 the shaft 12 transmitted.

As a result of the reaction moment, the relevant inclined contact surface 29 or 30 on each roller body 2 the normal force 32 exerted, which as a reaction to the flat end face 26 of the bearing ring 4, a force to the axial displacement 33 is generated (Fig. 6). In the present case, the force generated by the rolling elements 28 to Axial displacement 33 is transmitted directly to the axially displaceable bearing ring 4. The magnitude of the force to Axial displacement 33 is of the size of the concerned Circumferential force 34 dependent on the torque. The bigger that Torque of the power transmission element 19, the greater the force for axial displacement 33 each Rolling body 28. The angle of inclination et »of both contact surfaces 29.30 is sufficiently small so that in the contact between each roller body 2 8 and the flat end face 26 of the bearing ring 4 a self-locking friction (without the rolling elements 28 slipping through) when a torque is transmitted. If temporarily not Torque is transmitted from the power transmission element 19, the rolling elements 28 are through the coupling ring 15, which presses against the inner end face of the bearing ring 4, is axially loaded. The rolling bodies 28 received then through the coupling ring 15 a small minimum axial load, which prevents the rolling elements 28 with temporarily non-driven shaft 12 slide on the flat end face 26 of the bearing ring 4 and wear.

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ORIGINAL INSPECTED

In the case of an impermissibly high torque, a relatively large force for axial displacement 3 3 is generated by each roller body 2 8. This large force for axial displacement 33 presses the power transmission element 19 against the force of the Spring element 21 axially outward. In the process, the rolling bodies 28 finally come out of their depressions 31 and thus automatically release the non-rotatable connection between the power transmission element 19 and the inner bearing ring 4 (overload protection).

With the automatic adjustment of the pairs of mutually adjusted angular contact bearings 2.3 of the roller bearings for the over the power transmission member 19 driven shaft becomes both the resulting force for the axial displacement 33 as well as the driving torque of the power transmission element 19 generated or generated by the four rolling elements 28 distributed around the circumference and clamping in the circumferential direction. transfer. This force generation or transmission takes place by the rolling body 28, which between each one with an inclined contact surface 29,30 for the relevant Rolling body 28 provided in both directions of rotation axial recess 31 of the inner end face 27 of the power transmission element 19 and this end face 27 axially opposite outer end face 26 of the axially clamp the sliding bearing ring 4 rotatable with respect to the shaft 19.

In Fig. 7 a modified device is shown. The device consists, similar to the device of the previously described embodiment, from one Housing 1 and two angular contact bearings 2, 3 fixed in the bore of housing 1. The two angular contact bearings 2,3 are each equipped with an inner bearing ring 4.5, an outer

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ren bearing ring 6,7 and tapered rollers arranged between them 8 equipped. The lines of action of force 9, 10 of the two Angular contact bearings 2, 3 mutually converge radially outward. In the present embodiment the power transmission element 19 is sleeve-shaped and with the axially displaceable inner bearing ring of one angular contact bearing 2, which is on the outer surface of the Power transmission element 19 is set, connected. At the output end of the power transmission element 19 is a flange ring 35 held in the bore of the inner bearing ring by screws 36 on the power transmission element 19 attached. The sliding inner bearing ring 4 is supported by a shoulder surface 37 of the flange ring 35 versus withdrawal from the power transmission element 19 secured and held axially.

The flange ring 35, which is rigidly coupled to a corresponding flange 38 of the drive unit 24 by screws 3 9 is received from the drive unit 24, the shaft 12 driving torque. On one spigot end of the shaft 12, the shaft nut 20 is screwed on, which forms the structural unit consisting of the power transmission element 19, the flange ring 3 5 and the inner bearing ring 4 on the shaft 12 axially. Between the shaft nut 20 and the outer end face 40 of the flange ring 35 is a washer 41 made of elastically compressible material Rubber or the like. Arranged. This washer 41 can be small relative due to its own elasticity Rotational movements between the shaft nut 2 0 and the End face 40 (without sliding friction) closed with torsion spring.

The flange ring 35 and the power transmission element 19 are slidably rotatably mounted on the journal of the shaft 12. Lubrication grooves 42 in the bore of the pipe

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ORIGINAL INSPECTED

Stungsüberweisungeleraentes 19 and the flange 35 hold the lubricant (grease) in the sliding gap between the bore of the power transmission element 19 and the Pin of shaft 12 tight.

The inner bearing ring 5 of the other angular contact bearing 3 is on the outer surface of a sleeve-shaped coupling element 43 fixed by an interference fit. This coupling element 43 has on its the drive-side angular contact bearing facing end a flange 44 pointing radially inward.

The recesses 31 are on the axially displaceable bearing ring 4 facing end face of the flange 38 of the Power transmission element 19 arranged. The one with this on the cylindrical rolling body 2 8 cooperating The end face of the flange 44 of the coupling element 43 points axially outwards, that is to say from the axially displaceable bearing ring 4 way. The end face of the coupling element 43 also has depressions 45 distributed around the circumference. One each Recess 31 of the end face of the power transmission element 19 is a recess 45 of the coupling element 43 axially opposite. In the opposite The individual roller bodies 28 are arranged in depressions 31, 45, so that they are in these depressions 31, 45 are also held radially.

When transmitting torque through the power transmission element 19 the rolling elements 28 between the inclined contact surfaces of the respective circumferential direction of the two Wells 31,45 jammed. These thus transmit the torque from the power transmission element 19 . the coupling element 43. At the same time produce the rolling bodies 28 a mutual force for axial displacement,

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which between the end face of the power transmission element 19 and the end face of the coupling element 43 acts and these two end faces 19,43 from each other tried to push away. The two inner bearing rings 4, 5 are thus mutually loaded axially inwards and employed.

When the direction of rotation is changed, the in the circumferential direction opposite inclined contact surfaces of the two Depressions 31,45 each roller body 28 loaded. This in turn creates a mutual force for axial displacement from the rolling elements 28 to the power transmission element 19 and the coupling element 43 are transmitted. The two bearing rings 4, 5 are mutually employed with this force for axial displacement. Here you can the rolling bodies 28 move from the inclined contact surfaces of the previous direction of rotation to the circumferential direction opposite inclined contact surfaces 31, 45 shift a little at each indentation. The power transfer element 19 then performs a small sliding rotation on the journal of the shaft 12.

The sleeve-shaped coupling element 43 has internal teeth 46 non-rotatably connected in its bore with an external toothing 47 of the shaft 12 engaging in this .

The devices described above for the automatic adjustment of angular contact bearings that are adjusted in pairs a sliding or roller bearing for a driven shaft can be modified structurally. E.g. can the lines of action of the two angular contact bearings so be aligned so that these are mutually radially aligned

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ORIGINAL INSPECTED

diverging on the outside. In this case are then in the embodiment shown in Fig. 7 the to incorporate axial depressions for the rolling elements in the opposite end faces of the respective flanges. When torque is transmitted, the inner bearing rings of the two angular contact bearings are therefore affected by the force for axial displacement of the rolling elements axially from one another pushed away and hired each other.

In addition, the two angular contact bearings do not need to be used as roller bearings to be trained. Rather, at least one of the two angular contact bearings can be used as a hydrodynamic or hydrostatic one Be designed plain bearings with correspondingly tapered sliding surfaces.

In the embodiment shown in Figs roll the rolling body 28 in the circumferential direction between the flat end face 27 of the power transmission element 19 and the axially opposite flat end face 26 of the inner bearing ring 4 when they have emerged from their depressions 31 as a result of overload. For this Case it may be advantageous to install the rolling body 28 in a known cage between the two is arranged axially opposite end faces 26, 27 and the rolling bodies 28 also after their exit from the associated recesses 31 at a certain circumferential distance between the two end faces 2 holds 6.27.

In case the axial depressions only have an inclined contact surface are provided in one direction of rotation, they can alternate on the circumference with one for the one and for which the opposite direction of rotation is effective

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men contact surface for the rolling elements. In In this case, one part of the rolling elements arranged on the circumference only transmits that in one direction of rotation and the other part is the torque acting in the other direction of rotation. Spring elements known per se (Leaf springs, etc.) can then in each axial recess one of the two end faces between the Power transmission element and the non-rotatably connected bearing ring or the coupling element installed be, which the rolling body in question in the circumferential direction against its inclined contact surface free of play set up. In the event that the rolling bodies are held in a cage at a distance from each other, can these spring elements can be installed in the cage so that the spring elements are supported on the cage.

The torque generated by the rolling elements 28 can also be axially displaceable by a coupling element acting as a coupling element Bearing ring can be transferred directly to the shaft 12, i.e. without any further coupling element 15. In this In this case, the axially displaceable inner bearing ring 4 can have internal teeth in its bore with one in it meshing external toothing of shaft 12 (splined shaft) be rotatably connected and axially displaceable.

ORIGINAL INSPECTED

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Claims (10)

SKF KUGELLAGERFABRIKEN GMBH "Schweinfurt, 02/11/1983 DE 83 003 DE TPA.vh.tr i_gen_An £] t e l_l_en_von_ £ aarwe i_ ££ opposing angular contact bearings of a sliding Claims Device for the automatic adjustment of angular contact bearings of a sliding or roller bearing for a shaft driven via a power transmission element, in which the
Power transmission element is provided with a force for axial displacement receiving bearing ring, characterized in that between the output-side end of the power transmission element (19) and the axially displaceable bearing ring (4) non-rotatably connected to the shaft (12) or a bearing ring (4) which is axially displaceable with the shaft (12). 4) connected to the torque for
Shaft (12) conductive coupling element (15, 43) are arranged on the circumference distributed rolling bodies (28), which for clamping in one or in both circumferential directions in each case with an oblique con- tact surface (29,30) for the roller body (28) in the -2- COPY 1 one or both directions of rotation provided axial Recess (31,45) in at least one of the two axially opposite end faces (26,27) the power transmission element (19) and the bearing ring (4) or the coupling element (15, 43) are installed. 2. Device according to claim 1, characterized in that that the roller body (28) between an outer flat end face (26) of the axially displaceable bearing ring (4) and one of these parallel opposite inner end face (27) of the power transmission element (19) are arranged and that the Coupling element compressed by an axially resilient Coupling ring (15) is formed, which at its drive-side end with the inner End face of the via the roller body (28) coupled to the power transmission element (19) the shaft (12) slidingly displaceable bearing ring (4) and at its output end with the shaft (12) is firmly connected. 3. Device according to claim 1, characterized in that that the power transmission element (19) is sleeve-shaped and on seine.Mantelfläche the axially displaceable bearing ring (4) of one angular contact bearing (2) and on its between the two Angular contact bearings (2,3) arranged end carries a radially outwardly facing flange (38) which on the corresponding side with the one provided with axial depressions (31) for the rolling elements (28) Face is provided, and that the corresponding bearing ring (5) of the other angular contact bearing (3) -3- on the outer surface of a sleeve-shaped coupling element (43) is firmly seated, which at its the _r an end facing an angular contact bearing (2) has a radially inwardly facing flange (44) with an end face axially opposite the end face of the power transmission element (19). 4. Apparatus according to claim 3, characterized in that that the sleeve-shaped coupling element (43) over an internal toothing (46) in its bore with an external toothing (47) engaging in this the shaft (12) is rotatably connected. 5. Device according to one of the preceding claims, characterized in that the rolling body (28) cylindrical and the axial depressions by radially arranged uniformly on the circumference extending, a V-shaped cross-section having grooves (31) are formed. 6. Device according to one of the preceding claims, characterized in that the power transmission element (19) is annular and is rotatably mounted on the shaft (12). 7. Device according to one of the preceding claims, characterized in that the power transmission element (19) with one attached to the shaft (12), this over the roller body (28) against the - Outer end face (26) of the axially displaceable bearing ring (4) pressing spring element (21) connected is. -4- 8. Device according to one of the preceding claims, characterized in that the two angular contact bearings (2,3) are arranged with force lines (9,10) that mutually merge radially outward. 9. Apparatus according to claim 3 and 8 or 4 and 8, characterized in that the depressions (31) the end face of the flange (38) of the power transmission element pointing towards the axially displaceable bearing ring (4) (19) are arranged. 10. Device according to one of the preceding claims, characterized in that the rolling body (2 8) in one of these at mutual circumferential spacing from each other between the two axially opposite end faces (26,27) of the power transmission element (19) and from the axially displaceable bearing ring (4) or coupling element (43) holding Cage are installed.