DE102017011457A1 - Device for pressing a radial shaft seal on a crankshaft and corresponding method thereto - Google Patents

Abstract

The invention relates to a device for pressing in a radial shaft sealing ring (10) with a sealing lip (12) onto a crankshaft (29), the device comprising: - a carrier ring (14) for reversibly bearing against a crankshaft flange (30) of the crankshaft (29), wherein the carrier ring (14) has a central carrier ring opening (16) with internal thread, - a reversibly on the carrier ring (14) attachable and removable again Aufspreizring, and- a bell jar (20) for receiving the carrier ring (14) on its inside, wherein by means of a through a bell jar opening (22) guided bolt (24) whose head (26) on the outside of the bell jar (20) rests and whose shank (28) has an external thread with the internal thread of the carrier ring opening (24) 16) can be brought into threaded engagement, the thrust bell (20) in threaded engagement by turning the bolt (24) axially relative to the support ring (14) is displaceable, wherein at the carrier ring (14) befes the spreading ring (18) of the radial shaft seal (10) with correct alignment of the sealing lip (12) over the circumference of the support ring (14) is pushed, - the support ring (14) with radial shaft seal (10) reversibly with the flange flange removed ( 30) can be added, and upon attachment of the carrier ring (14) on the crankshaft flange (30) of the radial shaft seal (10) with sealing lip (12) by turning the bolt (24) approaching the inside of the bell jar (20) whose peripheral edge (32 ) at least indirectly forms a stop for the radial shaft sealing ring (10), from the circumference of the carrier ring (14) strippable and thus under close contact of the sealing lip (12) on the circumference of the crankshaft (29) on the crankshaft (29) and in a crankshaft ( 29) surrounding opening (40) of a control housing cover (38) is einpressbar.Die thrust bell (20) preferably comprises a stop ring (36) on a circumferential shoulder (34) a peripheral edge (32).

Description

The invention relates to a device for pressing a radial shaft seal with a sealing lip on a crankshaft and a corresponding method for pressing a radial shaft sealing ring with a sealing lip on a crankshaft.

Assembly tools for mounting crankcase covers are known. This is how the German patent application describes DE 10 2017 001 324 A1 a corresponding assembly tool with which a party-friendly mounting a crank housing cover is made possible on a crankshaft.

In the assembly of motors, the injection of a radial shaft seal on a crankshaft protruding through the opening of a timing cover, a critical step, since the correct pressing of the radial shaft seal and the correct orientation of belonging to this radial shaft sealing lip with respect to the crankshaft, the correct Sealing depends.

The object of the invention is to provide devices and corresponding methods with which radial shaft seals can be pressed onto crankshafts.

The invention results from the features of the independent claims. Advantageous developments and refinements are the subject of the dependent claims.

The object is achieved in a first aspect by a device for pressing a radial shaft sealing ring with a sealing lip onto a crankshaft, the device comprising: a support ring for reversibly bearing against a crankshaft flange of a corresponding crankshaft, the support ring having a central carrier ring opening with an internal thread; a reversibly attachable to the support ring and removable again Aufspreizring; and a bell jar for receiving the carrier ring on its inside. In this case, the device is designed so that by means of a bolt guided by a bell crank opening whose head bears against the outside of the bell jar and whose shaft has an external thread which can be brought into threaded engagement with the internal thread of the carrier ring opening, and the bell jar when threaded engagement by rotation of the bolt axially against the support ring is displaced. Furthermore, the radial shaft seal is slidable with the correct orientation of the sealing lip over the circumference of the support ring when the Aufspreizring is attached to the support ring. Furthermore, the support ring with radial shaft sealing ring located thereon is reversibly attachable to the crankshaft flange with the expansion ring removed, and when the carrier ring is attached to the crankshaft flange, the radial shaft sealing ring with sealing lip is at least indirectly an abutment for the radial shaft sealing ring by turning the screw bolt to approximate the inside of the bell jar forms, strippable from the circumference of the carrier ring and is thus pressed under tight contact of the sealing lip on the circumference of the crankshaft to the crankshaft and in a surrounding the crankshaft opening of a timing housing cover.

The Aufspreizring is attached to the side of the support ring, which is aligned when using the device to the crankshaft flange. By means of attachable to the support ring and again removable Aufspreizrings it is possible to simply postpone the radial shaft seal on the support ring, the inwardly facing sealing lip is automatically aligned correctly. A cumbersome positioning relative to the support ring, which would be required in the absence of Aufspreizring deleted. The Aufspreizring is conically designed for this purpose, with its outer periphery widens to the outer periphery of the thereto attached carrier ring. The radial shaft seal can be easily applied in this way at the pointed end of the cone and pushed so far over the Aufspreizring until it finally rests on the support ring. Subsequently, the Aufspreizring can be removed again from the support ring, now over the circumference of the radial shaft seal with correctly aligned sealing lip.

After removing the Aufspreizrings the carrier ring with the radial shaft sealing ring thereon can be reversibly attached to the crankshaft flange. By means of a guided by a sliding bell-mouth bolt whose head rests against the outside of the bell jar and whose shaft has an external thread which can be brought into threaded engagement with the internal thread of the carrier ring opening, now the bell jar is axially opposite by threaded engagement by turning the bolt the support ring displaceable, relative to the axis which extends in alignment through the push bell opening and the carrier ring opening. The inside of the bell jar, so aligned to the crankshaft flange side, comprises a peripheral edge which at least indirectly forms a stop for the radial shaft seal when the bell jar is approximated by turning the bolt to the support ring and finally contacted this. By further rotation of the bolt, the radial shaft seal is finally strippable from the circumference of the carrier ring, since the diameter of the bell jar is greater than the diameter of the carrier ring and the bell jar strikes this when attacking the radial shaft seal thus from the carrier ring. Since the carrier ring on Crankshaft flange is attached, can be during stripping of the radial shaft seal from the circumference of the support ring of the radial shaft seal under tight contact with the sealing lip on the circumference of the crankshaft and press into the opening of the timing housing cover which surrounds the crankshaft.

The correct end position of the radial shaft sealing ring in the gap between the crankshaft flange and the surrounding opening of the control housing cover can be determined for example by reaching a predetermined torque, which increases abruptly when the bell abuts the timing cover.

The device can be pressed unsecured at the Kurbelwellenflansch with removed Aufspreizring and slid onto the support ring radial shaft seal. According to a preferred embodiment, however, the carrier ring is releasably secured by means of screws when attached to the crankshaft flange. Accordingly, one or preferably at least two screws are guided through corresponding aligned openings of the carrier ring and the crankshaft flange. This advantageously prevents inaccuracies when pressing in the radial shaft sealing ring on the circumference of the crankshaft and in the opening of the timing housing cover surrounding the crankshaft, since the support ring remains stably positioned relative to the crankshaft flange by fastening by means of screws.

The peripheral edge forms at least indirectly a stop for the radial shaft seal. According to one embodiment, the peripheral edge accordingly forms directly a stop for the radial shaft sealing ring, so that after approaching the bell jar due to the rotation of the bolt, the peripheral edge of the bell jar strikes directly on the radial shaft sealing ring. According to an alternative embodiment, the peripheral edge of the poppet on a circumferential shoulder inwards, which is provided for receiving a stop ring. Accordingly, after approaching the bell does not strike the peripheral edge of the bell directly on the radial shaft seal, but indirectly over the arranged on the peripheral shoulder inwardly stop ring. Advantageously, this opens up the possibility to vary the achievable Einpresstiefe the radial shaft seal in the timing housing cover by using stop rings of different thickness. According to one embodiment, it is provided that between the circumferential shoulder and the underside of the stop ring for modifying the Einpresstiefe on the crankshaft flange and in the opening of the steel housing cover a shim is arranged. Accordingly, stop rings of the same thickness can be used, wherein the offset can be adjusted by the choice of shims of different thickness or combination of two or more shims with the same or different thickness.

According to one embodiment, the device has at least one guide element, by means of which the thrust bell can be guided relative to the carrier ring during axial displacement. Preferably, there is more than one guide element, for example two, three or four guide elements. According to a further development, the guide elements can be screwed into the carrier ring through corresponding guide openings in the bell jar so that a reliable guidance of the sliding bell relative to the carrier ring is made possible when the push bell is displaced axially relative to the carrier ring by turning the screw bolt.

According to one embodiment, on the one hand and the support ring on the other hand arranged between the inside of the poppet on the other hand, upon axial displacement of the poppet towards the support ring compressing coil spring. This coil spring contributes advantageously to the fact that after the press-fitting of the radial shaft sealing ring and rotating the bolt in the opposite direction, the disassembly of the device is facilitated. In particular, when the carrier ring is releasably fixed by means of screws when attached to the crankshaft flange, it is necessary according to a development that for access to the corresponding screws, the bell jar must be spaced from the carrier ring. A corresponding removal of the bell jar from the carrier ring is facilitated by the relaxing coil spring.

In a further embodiment, the bolt is guided over a slide bushing through the poppet opening. As a result, the axial displacement of the poppet relative to the carrier ring can advantageously be made friction-free. In particular, if the correct penetration depth of the radial shaft sealing ring is determined indirectly via the torque required for rotating the bolt, a falsification of the determined torque is advantageously reduced by frictional forces.

1. a) reversibles Anbringen des Aufspreizrings am Trägerring,
2. b) Schieben des Radialwellendichtrings über den Aufspreizring auf den Trägerring,
3. c) Abnehmen des Aufspreizrings,
4. d) Anlagern des Trägerrings an einem Kurbelwellenflansch,
5. e) Annähern des umfänglichen Randes der Schubglocke an den Radialwellendichtring durch Drehen des Schraubbolzens, und bei Kontakt des umfänglichen Randes mit dem Radialwellendichtring
6. f) Abstreifen des Radialwellendichtrings vom Trägerring durch fortgesetztes Drehen des Schraubbolzens und Einpressen des Radialwellendichtrings auf den Umfang der Kurbelwelle und in die die Kurbelwelle umgebende Öffnung eines Steuergehäusedeckels.

The object is achieved in a further aspect by a method for pressing a radial shaft sealing ring with a sealing lip onto a crankshaft using a device as described herein, comprising the following steps:

1. a) reversible attachment of the Aufspreizrings on the support ring,
2. b) pushing the radial shaft seal over the Aufspreizring on the support ring,
3. c) removing the Aufspreizrings,
4. d) attaching the carrier ring to a crankshaft flange,
5. e) approximating the peripheral edge of the bell jar to the radial shaft seal by turning the bolt, and upon contact of the peripheral edge with the radial shaft seal
6. f) stripping the radial shaft seal from the carrier ring by continued rotation of the bolt and pressing the radial shaft seal on the circumference of the crankshaft and in the surrounding the crankshaft opening of a timing case cover.

After the injection of the radial shaft seal, the device can be removed again from the crankshaft flange. If the device is detachably fastened to the crankshaft flange by means of screws, the accessibility of which requires removal of the bell jar from the carrier ring, then the bell jar can be correspondingly removed by turning the screw bolt in the opposite direction.

According to one embodiment, the turning of the bolt is continued in step f) until a predeterminable torque is achieved. The achievement of this torque accordingly indicates the achievement of the desired penetration depth.

According to one embodiment, before the implementation of step a) when using a device with a bell jar whose peripheral edge has a circumferential shoulder inwardly for receiving a stop ring, a corresponding stop ring is added or optionally before receiving the stop ring at least one shim between the circulating Paragraph and the stop ring arranged. Accordingly, the achievable press-in depth can advantageously be selected by selecting the stop ring and / or the additional shim or shims.

As part of the disclosure of the wiper, disclosures have, if any, been made implicitly or explicitly for the methods also described herein, and vice versa. Reference will also be made to such disclosures.

Further advantages, features and details will become apparent from the following description, in which - where appropriate, with reference to the drawings - at least one embodiment is described in detail. The same, similar and / or functionally identical parts are provided with the same reference numerals.

• 1 eine räumliche Schnittdarstellung einer Vorrichtung mit aufgesetztem Aufspreizring,
• 2 Teilfiguren zur Veranschaulichung eines Radialwellendichtrings mit Dichtlippe,
• 3 die Vorrichtung aus 1 mit zusätzlicher Passscheibe,
• 4 die räumliche Schnittdarstellung aus 1 mit Radialwellendichtring über dem Trägerring,
• 5 die Vorrichtung angesetzt an einen Kurbelwellenflansch und einen Steuergehäusedeckel,
• 6 die Vorrichtung aus 5 mit eingepresstem Radialwellendichtring,
• 7 einen Kurbelwellenflansch mit Steuerdeckel ohne Vorrichtung, und
• 8 ein schematisches Ablaufdiagramm.

Show it:

• 1 a spatial sectional view of a device with attached Aufspreizring,
• 2 Partial figures to illustrate a radial shaft seal with sealing lip,
• 3 the device off 1 with additional shim,
• 4 the spatial sectional view 1 with radial shaft seal over the carrier ring,
• 5 the device attached to a crankshaft flange and a control housing cover,
• 6 the device off 5 with pressed-in radial shaft seal,
• 7 a crankshaft flange with control cover without device, and
• 8th a schematic flow diagram.

1 shows in a sectional view of a device for pressing a radial shaft seal 10 , The device comprises a carrier ring 14 and a bell 20 , The bell 20 has a poppet opening 22 on, by a not identified by a reference numeral sliding bush a bolt 24 is guided. The bolt 24 includes a head 26 and a shaft 28 with external thread. Furthermore, the bell shows 20 a peripheral edge 32 with a paragraph 34 on, from the paragraph 34 a stop ring 36 is received. By turning the bolt 24 can be in the face of the threaded engagement of the bolt 24 in the carrier ring opening 16 with a corresponding internal thread the bell 20 axially opposite the carrier ring 14 move. With the carrier ring 14 screwed guide elements 42 provide for the axial displacement for a secure guidance of the bell 20 opposite the carrier ring 14 ,

For correct alignment of the sealing lip 12 of the radial shaft seal 10 this is the temporarily associated with the device Aufspreizring 18 deferred, the conical shape allows for easy sliding and with increasing broadening the sealing lip correctly aligned so that it does not bend in the direction in which the bell jar 20 thickened, but towards the tapered end of the bell 20. In 1 is the radial shaft seal 10 already largely on the Aufspreizring 18 postponed.

The offset of the radial shaft seal 10 and his lip 12 can be varied if between the paragraph 34 the bell 20 and the stop ring 36 a shim 46 is inserted, as in 3 shown in a sectional view.

2 shows the problem when pressing a radial shaft seal 10 with sealing lip 12 into a gap between a crankshaft flange 30 and a timing case cover 38 , In the left part 2A is a sectional view of a gap between a corresponding crankshaft flange 30 and a timing case cover 38 shown. In this case, a radial shaft seal 10 with his sealing lip 12 be pressed. The sealing lip 12 stands over the crankshaft flange 30 out and would be when pressed in by means of the partially indicated direction on the crankshaft flange 30 rubbing along and orienting in the wrong direction. In the right part 2 B is again an enlarged view of an example of a radial shaft seal 10 with associated sealing lip 12 shown.

In 4 is now in continuation of 1 a situation shown in which the radial shaft seal 10 completely over the expansion ring 18 was pushed away and now over the circumference of the carrier ring 14 pushed. The spreader ring 18 can now be removed from the device.

In 5 is again the carrier ring 14 with pushed over its circumference radial shaft seal 10 and correctly aligned sealing lip 12 shown. The carrier ring 14 is now on a crankshaft flange 30 a fragmentary crankshaft shown 29 attached. The crankshaft flange 30 and the control housing cover also shown only partially 38 are part of an otherwise not shown engine block. The carrier ring 14 is by means of screws on the crankshaft flange 30 detachably fixed, but the screws are in a different cutting plane and the sake of clarity, are not shown. The crankshaft flange 30 is axially centered in the opening 40 of the timing cover 38, whereby between the crankshaft flange 30 and the timing case cover 38 a gap is formed into which the radial shaft seal 10 to be pressed. Is at such a crankshaft flange 30 attached carrier ring 14 with a pushed over the circumference of the radial shaft seal 10 the bolt 24 so pressed that the bell 20 axially in the direction of the carrier ring 14 is moved, so first hits the stop ring 36 at the radial shaft sealing ring 10 if this is not already the case, then push it along with its sealing lip 12 in the gap between the crankshaft flange 30 and the timing case cover 38 ,

In 6 a corresponding situation is shown in which the bolt 24 was rotated to an axial displacement of the bell jar 20 towards the carrier ring 14 make. This shift turned the radial shaft seal 10 from the carrier ring 14 stripped and into the gap between the crankshaft flange 30 and the timing case cover 38 pressed. The coil spring 44 is compressed.

After pressing in the radial shaft seal 10 and his lip 12 can the bolt 24 be turned in the opposite direction to the bell jar 20 in the axial direction of the carrier ring 14 to remove what by the thereby relaxing coil spring 44 is supported. The device can be removed, so that then a crankshaft flange 30 and a timing case cover 38 exist between which the radial shaft seal 10 and his sealing lip 12 are pressed. The corresponding situation is in 7 shown.

8th shows a schematic flow diagram for a method for pressing a radial shaft seal with sealing lip on a crankshaft. In a first step a) reversibly attaching a Aufspreizrings to a support ring of a device described herein, in a step b) pushing a radial shaft seal on the Aufspreizring on the support ring, in a step c) a removal of the Aufspreizrings, in a step b ) An attachment of the support ring to a crankshaft flange, in a step e) approximating the peripheral edge of the bell jar to the radial shaft seal by turning the bolt, and upon contact of the peripheral edge with the radial shaft seal in a step f) stripping the radial shaft seal from the support ring through continued rotation of the bolt and a pressing of the radial shaft seal on the circumference of the crankshaft and in the surrounding the crankshaft opening of a timing case cover.

Although the invention has been further illustrated and explained in detail by way of preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. It is therefore clear that a multitude of possible variations exists. It is also to be understood that exemplified embodiments are really only examples that are not to be construed in any way as limiting the scope, applicability, or configuration of the invention. Rather, the foregoing description and description of the figures will enable one skilled in the art to more specifically exemplify the exemplary embodiments With the knowledge of the disclosed inventive idea, the person skilled in the art can make various changes, for example with regard to the function or the arrangement of individual elements mentioned in an exemplary embodiment, without leaving the scope of protection, which is covered by the claims and their legal equivalents, such as further Explanations in the description, is defined.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102017001324 A1 [0002]

Claims (10)

Device for pressing in a radial shaft sealing ring (10) with a sealing lip (12) onto a crankshaft (29), the device comprising: - A support ring (14) for reversibly attaching to a Kurbelwellenflansch (30) of the crankshaft (29), wherein the support ring (14) has a central support ring opening (16) with internal thread, - A reversible on the support ring (14) attachable and removable again Aufspreizring (18), and - A bell jar (20) for receiving the carrier ring (14) on its inner side, wherein by means of a through a bell jar opening (22) guided bolt (24) whose head (26) rests against the outside of the bell jar (20) and the Shaft (28) has an external thread which can be brought into threaded engagement with the internal thread of the carrier ring opening (16), the sliding bell (20) is axially displaceable with respect to the carrier ring (14) by threaded engagement by turning the screw bolt (24), in which - When the support ring (14) fixed Aufspreizring (18) of the radial shaft seal (10) with correct alignment of the sealing lip (12) over the circumference of the support ring (14) is slidable - The support ring (14) with befindlichem radial shaft seal (10) with removed Aufspreizring (18) reversible to the Kurbelwellenflansch (30) can be added, and at attachment of the support ring (14) on Kurbelwellenflansch (30) of the radial shaft seal (10) with sealing lip ( 12) by turning the bolt (24) approaching the inside of the bell jar (20) whose peripheral edge (32) at least indirectly forms a stop for the radial shaft seal (10), from the periphery of the carrier ring (14) strippable and thus under tight contact the sealing lip (12) on the circumference of the crankshaft (29) on the crankshaft (29) and in a crankshaft (29) surrounding the opening (40) of a control housing cover is pressed. Device after Claim 1 , characterized in that the carrier ring (14) when attached to the Kurbelwellenflansch (30) is releasably fixed by means of screws. Device according to one of the preceding claims, characterized in that the peripheral edge (32) of the poppet (20) has a peripheral shoulder (34) inwardly for receiving a stop ring (36). Device after Claim 3 , characterized in that between the peripheral shoulder (34) and the underside of the stop ring (36) for modifying the Einpresstiefe on the Kurbelwellenflansch (30) and in the opening (40) of the control housing cover (38) a shim (46) can be arranged. Device according to one of the preceding claims, characterized in that the device has at least one guide element (42), by means of which the thrust bell (20) relative to the carrier ring (14) can be guided with axial displacement. Device according to one of the preceding claims, characterized in that between the inside of the poppet (20) on the one hand and the support ring (14) on the other hand arranged on an axial displacement of the poppet (20) towards the support ring (14) compressing coil spring (44) , Device according to one of the preceding claims, characterized in that the screw bolt (24) is guided via a slide bushing through the push bell opening (22). A method for pressing a radial shaft seal (10) with a sealing lip (12) on a crankshaft using a device according to one of Claims 1 to 7 comprising the following steps: a) reversibly attaching the Aufspreizrings (18) on the support ring (14), b) pushing the radial shaft seal (10) via the Aufspreizring (18) on the support ring (14), c) removing the Aufspreizrings (18), d) attaching the carrier ring (14) to a crankshaft flange (30), e) approximating the peripheral edge (32) of the bell jar (20) to the radial shaft seal (10) by turning the bolt (24), and upon contact of the peripheral edge ( 32) with the radial shaft seal (10) f) stripping the radial shaft seal (10) from the carrier ring (14) by continued rotation of the bolt (24) and pressing the radial shaft seal (10) on the circumference of the crankshaft (29) and in which the crankshaft ( 29) surrounding opening (40) of a control housing cover (38). Method according to Claim 8 , characterized in that the rotation of the bolt (24) in step f) is continued until a predetermined torque is achieved. Method according to Claim 8 or 9 , characterized in that at a peripheral edge (32) having a circumferential shoulder (34) inwardly for receiving a stop ring (36), optionally before receiving the stop ring (36) at least one shim (46) between the peripheral shoulder (34) and the stop ring (36) is arranged.

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