INSTALLATION UNIT AND METHOD FOR INSTALLING A BEARING UNIT

Abstract

An installation unit for installing a bearing unit includes a carrier having an interior and the bearing unit mounted in the interior. The bearing unit includes a first rolling-element row and a second rolling-element row, and both the first rolling-element row and the second rolling-element row are at least partially disposed inside the carrier. The bearing unit is slidingly mounted in the carrier such that, when an end opening of the carrier is aligned with an opening in a bearing housing, applying a force against the bearing unit will slide the bearing unit out of the carrier and into the opening in the bearing housing. Also, a method of installing the bearing unit in the opening in the housing using the installation unit.

Claims

1. An installation unit for installing a bearing unit, the installation unit comprising: a carrier having an interior; and a bearing unit mounted in the interior and including a first rolling-element row and a second rolling-element row, each of the first rolling-element row and the second rolling-element row being at least partially disposed inside the carrier; and wherein the bearing unit is slidingly mounted in the carrier such that, when an end opening of the carrier is aligned with an opening in a bearing housing, applying a force against the bearing unit will slide the bearing unit out of the carrier and into the opening in the bearing housing.

2. The installation unit according to claim 1, wherein the interior of the installation unit includes at least one guide surface configured to guide at least one outer ring of the bearing unit when the bearing unit slides out of the carrier.

3. The installation unit according to claim 1, wherein the carrier is of one-piece construction.

4. The installation unit according to claim 1, wherein the carrier is substantially sleeve-shaped.

5. The installation unit according to claim 1, wherein the installation unit further comprises: a first outer ring on which at least a part of the first rolling-element row abuts; at least one second outer ring, on which at least a part of the second rolling-element row abuts; and at least one spacer axially disposed between the first outer ring and the second outer ring.

6. The installation unit according to claim 1, wherein the installation unit further comprises at least one centering element, different from the carrier, configured to center the installation unit relative to the opening.

7. The installation unit according to claim 1, wherein the installation unit further comprises at least one component abutting on an end side of an outer ring of the bearing unit and including a flange that protrudes radially inward toward an axis of rotation of the bearing unit.

8. The installation unit according to claim 1, wherein the carrier includes at least one projection on an inner surface.

9. The installation unit according to claim 1, wherein the interior of the installation unit includes at least one guide surface configured to guide at least one outer ring of the bearing unit when the bearing unit slides out of the carrier, wherein the carrier is formed one-piece and is substantially sleeve-shaped, wherein the bearing unit comprises a first outer ring on which at least a part of the first rolling-element row abuts, and at least one second outer ring, on which at least a part of the second rolling-element row abuts, and at least one spacer axially disposed between the first outer ring and the second outer ring, wherein the installation unit includes at least one centering element, different from the carrier, configured to center the installation unit relative to the opening, wherein the installation unit includes a seal carrier at an end side of an outer ring of the bearing unit having a flange that protrudes radially inward toward an axis of rotation of the bearing unit, and wherein the carrier includes at least one projection on an inner surface.

10. A method for installing a bearing unit into a bearing housing, the method comprising the steps of: providing a bearing housing having an opening and an installation unit including a carrier having an interior and a bearing unit mounted in the carrier interior and including a first rolling-element row and a second rolling-element row, each of the first rolling-element row and the second rolling-element row being at least partially disposed inside the carrier, the bearing unit being slidingly mounted in the carrier; aligning the installation unit with the opening in the bearing housing; and applying a force against an axial end of the bearing unit to slide the bearing unit out of the carrier and into the bearing housing.

11. The method according to claim 10, wherein the bearing unit includes a seal carrier and wherein applying the force comprises applying the force against the seal carrier.

12. An installation unit comprising: a sleeve-shaped carrier having an interior defined by a cylindrical inner surface and first and second axial end openings; and a bearing unit comprising a first rolling-element bearing having a first outer ring and a first row of rolling elements and a second rolling-element bearing having a second outer ring and second row of rolling elements, and a spacer ring different from the first outer ring and different from the second outer ring axially separating the first outer ring from the second outer ring; wherein the first outer ring and the second outer ring are disposed in the interior in contact with the inner surface of the carrier and retained in the interior by a press fit, and wherein the installation unit is configured such that, when the interior of the carrier is aligned with an opening in a bearing housing, applying a force against a first axial end of the bearing unit slides the bearing unit out of the carrier and into the opening in the bearing housing.

13. The installation unit according to claim 12, wherein the bearing unit includes a seal carrier at a first axial end of the carrier and the installation unit includes a centering ring, separate from the carrier, at a second axial end of the carrier.

14. A method of installing a bearing unit into a bearing housing, the method comprising the steps of: providing a housing having an opening, a carrier having an interior, a bearing unit including a first rolling-element bearing having a first outer ring and a first row of rolling elements and a second rolling-element bearing having a second outer ring and second row of rolling elements, a spacer ring different from the first outer ring and different from the second outer ring axially separating the first outer ring from the second outer ring, the first outer ring and the second outer ring being disposed in the interior in contact with an inner surface of the carrier and retained in the interior by a press fit, a seal carrier at a first axial end of the carrier, and a centering ring, separate from the carrier, at a second axial end of the carrier; placing the centering ring at the opening in the bearing housing to center the bearing unit relative to the opening; and applying a force against the seal carrier to slide the bearing unit out of the carrier and into the opening in the bearing housing.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0009] FIG. 1 shows a part of a partial section through an inventive installation unit along a longitudinal direction of the installation unit.

DETAILED DESCRIPTION

[0010] FIG. 1 shows an installation unit 10 that includes a bearing unit 12 and a carrier 14, and the installation unit 10 is configured for preinstallation and final installation of the bearing unit 12. The bearing unit 12 comprises a first rolling-element bearing that includes an inner ring 44, a first rolling-element row 16, and an outer ring 22. Furthermore, the bearing unit 12 includes a second rolling-element bearing that includes an inner ring 46, a second rolling-element row 18, and an outer ring 24. At least a part of the rolling-element row 16 abuts on the outer ring 22. Moreover, at least a part of the rolling-element row 18 abuts on the outer ring 24. The bearing unit 12 is disposed completely inside the carrier 14, and the carrier 14 is essentially sleeve-shaped, one-piece and comprised of plastic. The two inner rings 16, 18 are held together by a clip ring.

[0011] Furthermore, the bearing unit 12 includes a ring-shaped component or spacer 26 that abuts on an inner surface 38 of the carrier 14. The component 26 is disposed between the first outer ring 22 and the second outer ring 24 with respect to an axial direction 28 of the first outer ring 22 and furthermore abuts on mutually facing end sides of the first and second outer rings 22, 24, and thereby defines a minimum spacing between the first and second outer rings 22, 24. Furthermore, the component 26 can be comprised of steel. The first and second outer rings 22, 24 both abut on the inner surface 38 of the carrier 14. The bearing unit 12 is disposed inside the carrier 14 with a slight press-fit.

[0012] A component 32 (a seal ring) of the installation unit 10 abuts on an end side of the first outer ring 22, which end side is facing away from the second outer ring 24, and includes a partial region 34 (a flange) that protrudes radially inward toward the axis of rotation 36 of the bearing unit 10. If the bearing unit 10 is installed then the outer ring rotates during an operation process relative to the inner rings about the axis of rotation 36. A radially outer surface of the component 32 abuts on the inner surface 38 of the carrier 14. The component 32 forms a seal carrier 42 wherein elastomer that seals against the inner ring 44 is attached to the component 32 and in particular to the partial region 34.

[0013] The component 32 is sturdy. To install the bearing unit, a force is applied onto the outer ring 24 by using a punch or ram to apply a force on the side of the component 32 that faces away from the outer ring 22. The force may be up to 20 tons, and the component 32 is configured to remain functional despite this large force. The carrier 14 includes a projection 40, which protrudes slightly between the component 26 and the outer ring 14 and thereby causes a retaining force to be exerted on the component 26 by the projection 40 during a transport of the installation unit 10. Furthermore, on its inner surface 38 the carrier 14 includes further projections with analogous function for other components. A ring-shaped centering element 30 of the bearing unit is disposed on an axial inside of the bearing unit 12, which axial inside opposes the axial inside on which the component 32 is disposed; the centering element 30 is formed by a metal-plate element covered with elastomer, wherein the elastomer seals tightly relative to the inner ring 46. The centering element 30 protrudes in the axial direction starting from inside carrier 14 along the carrier 14 and out into a region outside the carrier 14. With the installation of the bearing unit 12 in the bearing housing the centering element 30 is initially placed in a corresponding opening of the bearing housing so that a radial-side shifting of the installation unit 10 relative to the bearing housing is prevented. Upon applying force on the component 32 using the punch or ram, the bearing unit 12 then shifts relative to the carrier 14 and slides out of the carrier and into the opening of the bearing housing, wherein a guide surface 20, which is formed by the inner surface 38 of the carrier 14, guides a movement of the entire bearing unit 12 into the opening. The projections, i.e., in particular, the projection 40, do not prevent a movement of the bearing unit 12 relative to the carrier 14. Inside the carrier 14 a cylindrical region is left open directly adjacent to the component 32 so that the punch or ram can be easily positioned in this region prior to an application of force.

[0014] Since the entire bearing unit 12 is disposed inside the carrier 14 prior to installation, it is possible to uniformly center the parts of the bearing unit 12 relative to one another and with respect to the bearing housing. Furthermore, the bearings and seals can be inserted into the bearing housing in a single press stroke, which reduces the installation effort, in particular compared to so-called taper matched units (with these all outer rings and seals must be sequentially installed into the bearing housing). In addition, for example, damage to seals that are not precisely centered at a point in time of the installation process is avoided. The arrangement of the entire bearing unit 12 inside the carrier 14 prior to the installation brings with it the further advantage that the penetration of dirt into the bearing unit 12 is prevented, and it is also prevented that lubricant of the bearing leaks out and is lost.

[0015] The end side of the carrier bearing opposite the component 32 can have a chamfer corresponding to the bearing housing so that a positioning of the carrier 14 relative to the bearing housing is simplified.

[0016] After the installation process the carrier 14 is undamaged and can be reused and returned to a factory wherein the installation unit 10 is manufactured. If this return is too complicated, it is advantageous to only provide the required rigidity for the carrier 14 in order to save costs. In an advantageous manner the punch or a plate made from plastic is delivered together with the installation unit so that the force can be transmitted in a simple manner onto the bearing unit. It can thereby be ensured that the customer has a suitable device for force transmission onto the bearing unit during the installation.

[0017] Representative, non-limiting examples of the present invention were described above in detail with reference to the attached drawings. This detailed description is merely intended to teach a person of skill in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the invention. Furthermore, each of the additional features and teachings disclosed above may be utilized separately or in conjunction with other features and teachings to provide an improved installation unit and method for installing a bearing unit.

[0018] Moreover, combinations of features and steps disclosed in the above detailed description may not be necessary to practice the invention in the broadest sense, and are instead taught merely to particularly describe representative examples of the invention. Furthermore, various features of the above-described representative examples, as well as the various independent and dependent claims below, may be combined in ways that are not specifically and explicitly enumerated in order to provide additional useful embodiments of the present teachings.

[0019] All features disclosed in the description and/or the claims are intended to be disclosed separately and independently from each other for the purpose of original written disclosure, as well as for the purpose of restricting the claimed subject matter, independent of the compositions of the features in the embodiments and/or the claims. In addition, all value ranges or indications of groups of entities are intended to disclose every possible intermediate value or intermediate entity for the purpose of original written disclosure, as well as for the purpose of restricting the claimed subject matter.

REFERENCE NUMBER LIST

[0020] 10 Installation unit [0021] 12 Bearing unit [0022] 14 Carrier [0023] 16 Rolling-element row [0024] 18 Rolling-element row [0025] 20 Guide surface [0026] 22 Outer ring [0027] 24 Outer ring [0028] 26 Component [0029] 28 Direction [0030] 30 Centering element [0031] 32 Component [0032] 34 Partial region [0033] 36 Axis of rotation [0034] 38 Inner surface [0035] 40 Projection [0036] 42 Seal carrier [0037] 44 Inner ring [0038] 46 Inner ring