JP5599229B2 - Method of pressure forming end face dentition - Google Patents

Description

  The present invention relates to a method for pressure-molding an end face tooth row from a rocking and tightening protrusion of a rolling bearing, particularly a wheel bearing. Furthermore, the present invention relates to a rolling bearing or a wheel bearing provided with a suitably shaped end face tooth row.

  Such a method is used when manufacturing wheel bearings, particularly in the automotive field.

  As previously understood, other rolling bearings with not only wheel bearings but also rocking clamp projections can be coupled with the drive elements of the drive train, preferably via end face teeth. This can save structural space or avoid problems with radial dentitions.

  In U.S. Pat. No. 20010046339, a method of deforming the end of a wheel hub is known, where the end is molded into a swinging and clamping projection. While the swinging and tightening protrusion is formed by a so-called snap as a contact tool, unnecessary expansion of the inner ring is avoided by being supported by the support member from the radially outer side to the inner side.

  The end portion of the wheel hub is molded in the axial direction and the radial direction by the snap molding method. In this case, teeth oriented in the axial direction are formed, and the teeth form a dentition circle centered on the rotation axis. Such a method as well as a corresponding wheel bearing with a swinging and tightening projection formed with end face dentitions is due to WO 2006105748.

  The tooth gap depth of the end face dentition is a decisive value in the case of axial transmission of a high rotational moment. The greater the tooth gap depth, the greater the maximum rotational moment transmitted. However, when producing a large number of thin teeth with a large tooth gap depth, the snap forming method is limited. The tooth recess is actively formed on the basis of the swinging of the contact tool (a motion that causes the contact tool to sequentially move so that the contact portion between the contact tool and the end of the hub forms a circle). However, the tooth tips are difficult to mold. This is because the material flow direction is opposite to the force acting direction, and the clamping protrusion to be molded acts against the expansion of the surface.

  Further, as is apparent from practice, end face dentitions are often unevenly formed by the snap forming method, in which case the engagement to the opposing dentition is not adapted with sufficient accuracy for even torque transmission.

US Patent No. 20010046339 International Publication No. 2006105748 Pamphlet

  Accordingly, an object of the present invention is to provide a method in which the above-mentioned drawbacks are eliminated by improving the method of pressure-molding the end face dentition and the rolling bearing provided with the end face dentition as described at the beginning. is there.

  According to the method of the present invention for solving this problem, in the method of press-molding an end face tooth row from a rolling bearing, particularly a swinging and tightening protrusion of a wheel bearing, in the first step, the end of the hub is Before deforming, the female mold is placed in the axial direction on the rolling bearing in the pre-assembled state, and in the second step, the end is deformed, and at the same time the end face dentition is formed, the female mold is formed. The radial spread of the swinging and tightening protrusion is limited in the radial direction.

  Advantageously, the female mold forms the axial and / or radial outer surface of the rocking clamp projection.

  Advantageously, the inner add-on part of the female molds and limits the radially outer surface of the rocking and clamping protrusion.

  Advantageously, the clamp ring supports the inner ring of the rolling bearing in the radial direction from outside to inside during the second step.

  Advantageously, the clamp ring is attached to the female mold or is integrally connected to the female mold.

  Furthermore, in order to solve this problem, in the configuration of the present invention, a rolling bearing, particularly a wheel bearing, is provided with a swinging and tightening protrusion formed integrally with an end tooth row. Is configured to be radially limited and / or molded with a radially outer surface during the formation of the swinging and clamping projections.

  Advantageously, the outer surface of the rocking and clamping protrusion is shaped like a ring, a cone or the like.

  Advantageously, the outer surface of the rocking and tightening projection has a recess which is continuous in the circumferential direction, in particular repeatedly.

  Advantageously, a circumferentially continuous recess is formed as an encoder.

  Advantageously, the outer surface is at least partly provided as a seat for the encoder ring or sealing element.

The method of pressure-forming an end face tooth row from a rocking and tightening protrusion of a rolling bearing, in particular a wheel bearing, according to the present invention comprises at least the following steps.
a) In the first step, for example, after the end of the rolling bearing hub is finally deformed, for example, after the end has been shaped and pretreated (so-called edge expansion), The female mold is axially arranged on the rolling bearing in the pre-assembled state. The end portion may be, for example, a hollow cylindrical end portion of a hub, and the wheel hub is deformed not only in the axial direction but also in the radial direction by the contact tool. The hub of the rolling bearing is a portion of the rolling bearing that can be machined. In the case of a wheel bearing, a wheel flange is integrally formed with this portion.

  In the pre-assembled state, the hub or the inner ring or rings, the outer ring and the rolling elements are already arranged side by side in the driving position, and finally joined by cold working deformation of the rocking and tightening protrusion Thus, a rolling bearing unit is formed.

b) During the second step, the end of the hub is deformed, and at the same time the end face dentition is formed, the female mold restricts the radial spread of the swinging and clamping protrusion to be formed. Here, the rolling bearing unit is preloaded by the formed rocking and clamping protrusions to fix the inner ring in the axial direction.

  A female die is a tool used like a die as an element that performs some kind of restriction in order to restrict radial spread during cold deformation. As a result, the material flow of the swing clamp tightening protrusion is strongly directed in the axial direction during cold deformation. Therefore, the shape imparting by the contact tool (the force action of the contact tool is directed against the material flow) is generally performed well. The tooth portion of the end face dentition can be accurately formed. For example, it is possible to realize a relatively large axial tooth height that cannot be obtained without a female mold.

  Advantageously, the female mold forms the axial and / or radial outer surface of the rocking clamp projection. In addition to the radial restriction by the female mold, the female mold is also used to give the shape of the swinging and tightening protrusion. This applies, for example, to a cylindrical outer surface and also to the outer surface in the axial direction of the swing clamp projection. Therefore, a very high degree of freedom of construction is obtained, and it is advantageously used for the desired shape of the swinging and clamping projection. The female mold and the application tool cooperate to produce the desired material flow. As a result, it is possible to manage the occurrence of material loss that can occur with the female mold and the abutting tool, and a more accurate shape can be obtained when the deformation pressure acting on the formed swing clamp projection is increased. It is done.

  Advantageously, the inner addition of the female mold shapes and restricts the radially outer surface of the rocking and clamping protrusion. When the inner addition part is used as a limiting element, it is advantageous to provide various inner addition parts for various predetermined shapes of the swing clamp projection, in which case the inner addition part can be inserted into a female mold. is there.

  Advantageously, the clamping ring supports the inner ring of the rolling bearing from the outside inward in the radial direction during the deformation process (second step). Such a clamp ring prevents the inner ring from undesirably expanding in the radial direction during the snap molding.

  Advantageously, the clamp ring is fixed to the female mold or is integrally connected to the female mold. Due to the integral form, radial support of the inner ring is ensured at the same time in one working step, that is to say when the female mold is placed on the pre-mounted rolling bearing.

  A rolling bearing according to the present invention, particularly a wheel bearing, includes a swinging and tightening protrusion having an integrally formed end tooth row, and the swinging and tightening protrusion forms a swinging and tightening protrusion. In the meantime, it is designed to be radially limited and / or molded on the radially outer surface, the rolling bearing has a uniform dent pressing part and an optimum tooth gap depth Can be used to transmit high rotational moments.

  Advantageously, the outer surface of the swinging and clamping projecting portion is formed into a ring shape, a conical shape or the like in the swinging and clamping process. The swinging and tightening protrusion can be advantageously formed on the rolling bearing. For example, the rocking squeeze protrusions assist the sealing function of the seal arrangement structure or form a seal gap with another component, such as a joint housing.

  Advantageously, the outer surface of the rocking and tightening projection has an indented recess that is continuous in the circumferential direction, in particular repeatedly. Accordingly, the swinging and tightening protrusion is useful for attaching information related to, for example, manufacturer's display, serial number, standard, and product symbol.

  Advantageously, the indentation recesses present continuously in the circumferential direction are formed as encoders. Therefore, the structural members that are extremely effective in terms of manufacturing technology are assembled, and a stable sensor wheel can be obtained. Typically, an encoder must be used as a separate component that requires a separate manufacturing step. This step is no longer necessary. Furthermore, the encoder is not axially spaced from the sensor of the rotational speed measuring device. Therefore, extremely reliable rotation speed measurement is guaranteed.

  Advantageously, the outer surface of the rocking and clamping projection is at least partly provided as a seat for the encoder or sealing element. The outer surface is optimally formed for each component. This means, for example, that the friction coupling (the friction coupling means a coupling based on the frictional force between the members) by the generally smooth outer surface, and the shape coupling (the shape coupling by the outer surface having an element that engages each component member). Means the connection based on the mutual geometrical relationship such as fitting or meshing).

  Further aspects and advantageous refinements of the invention can be taken from the drawings and / or the dependent claims.

It is a longitudinal cross-sectional view which shows the wheel bearing pre-assembled with the female type | mold before the rocking | tightening clamping process. It is a longitudinal cross-sectional view which shows the wheel bearing pre-assembled with the female die in the state after the rocking and tacking step.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  In FIG. 1, in the first step of the method of press-molding the end face dentition as the front tooth profile part, the rocking and tightening process (working while swinging so as to knead the abutment against the work part) The step of applying a desired shape while expanding in the radial direction so as to squeeze the part) in the state before the third generation wheel bearing unit pre-assembled (pre-assembled) together with the female mold 5 Shown in the figure.

  The deformable cylindrical end portion 9 of the wheel hub 2 is cold deformed in a predetermined rocking and tightening process. For this purpose, the female mold 5 is arranged in a pre-assembled wheel bearing unit, and the molding surface 8 of the inner addition part 7 is a protruding protrusion in the radial direction as a collar formed by a swinging and tightening protrusion (a collar formed by the swinging and tightening process). Part) used for radial restriction and molding. The molding surface 8 is cylindrical, which gives the rocking clamp protrusion a similarly cylindrical shape. The molding surface 8 may be formed in a conical shape for the purpose of good mold release.

  The inner addition portion 7 is formed integrally with the female die 5, thereby maintaining easy implementation of the pressure molding method.

  Advantageously, the clamp ring 6 is likewise formed integrally with the female die 5 and is conically formed radially inward. Due to the conical shape, radial support of the inner ring 4 can be obtained, and the radial support force can also be adjusted by an increased axial (pre-load) preload (preload).

  Advantageously, the rolling elements of the outer ring 1 and the rolling element row 3 are not involved in force transmission, so that these components are not damaged during the swinging and clamping process.

  Optionally, the molding surface 8 may have any desired shape that can be machined into the swing clamp projection. Based on the centering of the female die 5 by the inner ring 4, the radial runout of the end face teeth is additionally improved.

  FIG. 2 is a longitudinal sectional view of the wheel bearing unit that has been pre-assembled together with the female mold 5 in a state after the swinging and clamping process.

  After the cold deformation process, the pressure molding of the end face tooth row 10 is completely completed. A cylindrical shape of the molding surface 8 (see FIG. 1) is given to the outer surface 11 in the radial direction of the swinging and clamping projection 12.

  The female mold 5 can be removed in the axial direction. This is because the swinging and tightening protrusion 12 holds the preload of the rolling elements via the bearing wheels 1 and 4 and the wheel hub 2.

  The present invention relates to a method for pressure forming a rolling bearing, in particular a wheel bearing. The problem is to improve the leveling of the end face dentition and realize a relatively large tooth gap depth. This is achieved by two method steps, in which the female mold is placed axially on the rolling bearing in the pre-assembled state before the end of the hub is deformed, and in the second step the end is While the part is deformed and the end face dentition is formed, the female die restricts the radial extension of the swinging and clamping projection to be formed. Furthermore, the inner ring expansion in the radial direction is suppressed or prevented by the female mold.

  DESCRIPTION OF SYMBOLS 1 Outer ring, 2 Wheel hub, 3 Rolling element row, 4 Inner ring, 5 Female type, 6 Clamp ring, 7 Inner addition part, 8 Molding surface, 9 Deformable cylindrical end part, 10 End face tooth row, 11 Oscillation The outer surface of the lash tightening protrusion, 12 The swing lash tightening protrusion

Claims (3)

In the method of pressure-molding the end face tooth row (10) from the protrusion (12) of the rolling bearing,
A first step of axially arranging the female die (5) on the rolling bearing in a pre-assembled state before deforming the end (9) of the hub (2);
While the end portion (9) is deformed and the end face dentition (10) is formed at the same time, the female die (5) restricts the radial expansion of the formed protrusion (12) in the radial direction. Two steps,
With
Between the first step and the second step , center the female die (5) with respect to the center axis of the rolling bearing using the inner ring (4) of the rolling bearing ,
During the second step, the clamp ring (6), which is integrally joined with the female mold (5), supports the inner ring (4) of the rolling bearing from outside to inside in the radial direction , A method of pressure forming an end face dentition.   The method according to claim 1, wherein the female mold (5) molds the axial and / or radial outer surface (11) of the protrusion (12).   Method according to claim 2, wherein the inner addition (7) of the female mold (5) shapes and limits the radial outer surface (11) of the protrusion (12).

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