DE20214362U1 - Device for extracting a vibration damper - Google Patents

Description

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn ."."" .""..". .·*.." September 16, 2002

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Applicant ref.: K

Applicant: Klann Tools Ltd., 13 Harrier Park, Didcot, Oxfordshire, OXIl 7PL, GB

Applicant No.: 8 635978

Designation: Device for removing vibration dampers

Description

The invention relates to a device for removing a vibration damper pressed onto a centering projection of a toothed belt pinion, wherein the toothed belt pinion is mounted in a rotationally fixed manner on a bearing journal of a crankshaft of a motor vehicle engine and wherein the toothed belt pinion is fastened to the bearing journal by means of a central mounting screw, by means of which the vibration damper is simultaneously held on the centering projection and wherein a plurality of retaining screws distributed around the circumference and screwed into the toothed belt pinion are provided for the rotationally fixed connection of the vibration damper to the toothed belt pinion and wherein the device has a support device provided with a pressure spindle, which can be firmly mounted on the vibration damper.

As is well known, so-called vibration dampers are generally used in motor vehicle engines, which

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn ·**;{!!* ·**··**· .**,.**. September 16, 2002

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are firmly attached to the end of the crankshaft of the motor vehicle engine. Such vibration dampers are used to dampen torsional vibrations that regularly occur in motor vehicle engines in order to prevent the motor vehicle engine from being destroyed in certain speed ranges.

In newer engine designs, a toothed belt pinion is provided axially on the crankshaft between such a vibration damper and the engine housing. This is part of the toothed belt drive of the camshaft drive of such a motor vehicle engine. Since both the toothed belt pinion and the vibration damper are arranged on the same bearing journal of the crankshaft, a special fastening is also provided for this. In particular, it should be ensured that in the event of damage, the vibration damper can be removed separately from the crankshaft, while the toothed belt pinion should remain on the bearing journal of the crankshaft if possible in order to avoid having to readjust the timing for the camshaft.

In the known engine designs, the timing belt pinion sits directly on the crankshaft bearing journal via a bearing hub. This bearing hub of the timing belt pinion

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn ""i!!" ·"··**. .**.." September 16, 2002

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has an axially protruding centering projection onto which the vibration damper is mounted. To ensure a secure connection of the bearing hub of the toothed belt pinion, a mounting screw is usually screwed centrally into the bearing journal of the crankshaft. The rotationally fixed connection of the toothed belt pinion with its bearing hub on the bearing journal is achieved in different ways, with form-fitting rotary joints often being provided to ensure precise angular alignment of the toothed belt pinion with respect to the crankshaft. In order to also connect the vibration damper to the crankshaft in a rotationally fixed manner via the centering projection of the toothed belt pinion, the vibration damper has a corresponding mounting flange, by means of which it is clamped onto the centering projection of the toothed belt pinion. For assembly, several mounting screws are usually distributed around the circumference of the mounting flange, which axially protrude through the mounting flange of the vibration damper and are screwed into corresponding threaded holes in the toothed belt pinion.

The mounting flange of the vibration damper also has a central through hole, which is

K283.doc ;**.

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NeyMEYER & PARTNER GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn »**.J*** .",.**. ·**,.**. September 16, 2002

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The mounting screw for the toothed belt pinion is penetrated and is also held in place by this mounting screw. This means that in order to remove the vibration damper in the event of damage, the central mounting screw of the toothed belt pinion must first be removed. The mounting screws arranged around the circumference of the mounting flange can then be removed.

For subsequent removal, support devices are generally used which are provided with a central pressure spindle. The support device is generally mounted firmly on the circumference of the vibration damper and has a central middle bar into which the pressure spindle is screwed. If the central mounting screw of the toothed belt pinion is now loosened and not completely removed, the pressure spindle is supported on the screw head of this central mounting screw during the removal process, so that a pulling effect is exerted on the vibration damper.

If the toothed belt pinion is pressed onto the crankshaft or the bearing journal, the vibration damper is pulled off the centering shoulder of the toothed belt pinion. However, if the bearing hub of the toothed belt pinion is not pressed onto the bearing journal of the crankshaft,

K283.doc

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn '&iacgr;&udigr;! \"H^I /*t.". September 16, 2002

It cannot be ensured that when the vibration damper is removed the toothed belt pinion is not also pulled off the bearing journal of the crankshaft.

There are also other devices known in which the support device is supported on the engine housing. Even with these designs, it cannot be guaranteed that the toothed belt pinion will not be inadvertently pulled off the crankshaft bearing journal when the vibration damper is removed. However, this should be avoided because, as already mentioned above, after the toothed belt pinion has been removed from the crankshaft bearing journal, the timing for controlling the camshaft must be checked and reset when the toothed belt pinion is later reassembled.

Accordingly, the invention is based on the object of designing a device of the generic type in such a way that the vibration damper can be safely removed from the bearing flange of the bearing hub of a toothed belt pinion sitting on the crankshaft without there being a risk that the toothed belt pinion will also be removed from the bearing journal of the crankshaft.

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn ""iijl* l'**l**l '*'l'*** September 16, 2002

The object is achieved according to the invention in conjunction with the features of the preamble of claim 1 in that a pressure plate and several axial pressure pins are provided for axially supporting the pressure spindle (5) on the toothed belt pinion, which can be screwed into the mounting threads of the toothed belt pinion after the assembly screws have been removed and project axially outwards beyond the vibration damper.

The design according to the invention provides a device for removing a vibration damper, which ensures that the toothed belt pinion with its bearing hub remains securely on the bearing journal of the crankshaft when the vibration damper is removed. For this purpose, a pressure plate is provided which, in conjunction with several axial pressure pins, is axially supported directly in the mounting threads of the toothed belt pinion. This means that in order to remove the vibration damper, the central mounting screw for the bearing hub of the toothed belt pinion must first be removed, since this central mounting screw also fastens the mounting flange of the vibration damper to the centering shoulder of the toothed belt pinion. In the further course of the process, the

K283.doc

NEYMEYER & PARTNER GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE) MN/mn ·!·&diams;··»·&diams;»"· September ¹⁶ , 2002

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Mounting screws of the mounting flange of the vibration damper have been removed. These mounting screws serve as an additional connection between the mounting flange of the vibration damper and the toothed belt pinion, so that there is a rotationally fixed connection between them via these mounting screws.

After these circumferential mounting screws have been removed, the axial pressure pins are screwed into the correspondingly freed mounting threads of the bearing flange of the toothed belt pinion. The axial pressure pins are designed in such a way that they protrude axially beyond the mounting flange of the vibration damper. The pressure plate is then placed on these axial pressure pins. After the support device is attached to the circumferential surface of the vibration damper, for example, the central pressure spindle is supported axially on the pressure plate when it is actuated. When the pressure spindle is actuated further, it now presses against the pressure plate in the axial direction, which in turn is supported directly on the toothed belt pinion in its threaded holes via the axial pressure pins provided.

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn * YJ^" ;**JJ**; t"».". September 16, 2002

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Thus, the device according to the invention directly causes an axial relative movement between the vibration damper and the toothed belt pinion during the removal process or actuation of the pressure spindle, whereby accidental removal of the toothed belt pinion from the bearing journal of the crankshaft is safely excluded, since the device according to the invention is axially supported directly on the toothed belt pinion via the axial pressure pins.

Further advantageous embodiments of the invention can be found in the further dependent claims.

2. The design according to claim 2 allows the support device to be easily mounted on the vibration damper, whereby the support bridge provided ensures a precise, centered arrangement of the pressure spindle. For this purpose, according to claim 2, the support device is formed from two approximately semi-cylindrical clamping shells, which can be mounted on the circumference of the vibration damper in a clamping or form-fitting manner, and that a transverse clamping ring is provided on the clamping shells mounted on the vibration damper, which clamps the two clamping shells.

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn "*'&iacgr;&iacgr;|·* &iacgr;"?&iacgr;**&idigr;&iacgr;"***** September 16, 2002

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binding support bridge is detachably mounted, into which the pressure spindle can be screwed centrally, axially.

3. Due to the screw heads provided on the axial pressure pins according to claim 3, with which the axial pressure pins are supported in axial recesses of the pressure piece during the removal process, the pressure piece can be attached to the axial pressure pins in a simple manner, whereby at the same time relatively large pressures can be absorbed via the screw heads.

4. According to claim 4, through holes can be provided concentrically to the depressions in the pressure plate, through which the axial pressure pins can be adjusted by means of a suitable wrench tool to adjust their length axially projecting beyond the vibration damper. This design allows the axial pressure pins to be adjusted in length even when the pressure plate is placed on them, so that the pressure plate can be aligned parallel to the vibration damper. This also achieves a more even pressure distribution on the axial pressure pins.

K283.doc

Neymeyer & PARTNER GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn **"*·· * * &iacgr;*'?&idigr;*'&idigr; ·*%·**» September 16, 2002

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5. The design according to claim 5 ensures a concentric introduction of force from the pressure spindle into the pressure plate and from there via the axial pressure pins into the toothed belt pulley, so that tilting of the vibration damper on the centering projection of the toothed belt pulley is reliably prevented. For this purpose, the pressure plate has a central depression with a central centering recess for the centered reception of a pressure ball of the pressure spindle on its outer surface axially opposite the depressions.

An embodiment of the invention is explained in more detail below with reference to the drawing. The invention is not limited to the specific embodiment described, but includes all combinations of features of the formulated claims. It shows:

Fig. 1 shows the individual components of a device according to the invention;

Fig. 2 is a front view of a vibration damper mounted on the crankshaft of a motor vehicle engine;

Fig. 3 shows a section III - III from Fig. 2;

NEYMEYER & PARTNER GbR, Patent Attorneys MN/mn

78052 Villingen-Schwenningen (DE) ? 16 September 2002

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Fig. 4 shows the sectional view from Fig. 3 with a device according to the invention attached to the vibration damper.

As can be seen from Fig. 1, the device 1 according to the invention consists of two clamping shells 2, 3, a support bridge 4, a pressure spindle 5, a pressure plate and four axial pressure pins 7.

The two clamping shells 2, 3 together with the support bridge form the actual support device, which can be attached to a vibration damper in a fixed manner in order to remove it. For this purpose, the two clamping shells 2 and 3 are approximately semi-cylindrical and extend over a circumferential angle α or β of 180° respectively. The inner surfaces 8 and 9 of the two clamping shells 2 and 3 are profiled. The clamping shell 2 and 3 has a "tooth profile" on its inner surface, 11 or 12, with which these clamping shells 2 and 3 can be attached to a vibration damper in an axially fixed manner. The clamping shells are intended for attachment to a vibration damper, which also serves as a V-belt pulley and has a corresponding V-belt profile for holding the V-belt on its circumference. To attach to such a vibration damper, the two clamping shells

K283.doc

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78052 Villingen-Schwenningen (DE) 16 September 2002

Neymeyer & Partner GbR, patent attorneys
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shells 2 and 3 are placed radially on the vibration damper,
so that they form a closed counter body when assembled. To connect the two
Clamping shells 2 and 3 are corresponding connecting screws
12 and 13, each of which has a
Through hole 14 or 15 of radially outward directed
Connecting flanges 16 and 17 of the clamping shell 2 extend tangentially to the ring body and are inserted into a threaded bore 18 and 19 of corresponding mirror-symmetrically arranged connecting flanges 20 and 21, respectively.
21 of the second clamping shell can be screwed in.

Furthermore, each of the clamping shells has radially further inward through threads 22, 23 and 24, 25 in the area of their connecting flanges 16, 17 and 20, 21 respectively.

These through threads 22, 23 and 24, 25 are used for

firmly mounted the support bridge 4 on the
support ring formed by both clamping shells 2 and 3.
Corresponding mounting screws 26 are provided, which are arranged at the appropriate distance from each other

Through holes 27 of the support bridge 4 can be inserted.

Furthermore, it can be seen from Fig. 1 that the support bridge has a central through-thread 28, in which

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Neymeyer & Partner GbR, Patent Attorneys _t 78052 Villingen-Schwenningen (DE)

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ches the pressure spindle 5 can be screwed in. When attached to a vibration damper, the two clamping shells 2 and 3 form the support bridge 4 and the pressure spindle 5 forms a support device firmly attached to the vibration damper.

It can also be seen from Fig. 1 that the pressure plate 6 has a substantially circular basic cross-section, which is also provided with a radial recess 2 9. This radial recess is only necessary if the outside of a vibration damper in the area of its mounting flange is provided with corresponding radially inwardly directed projections.

Furthermore, the pressure plate in the present embodiment has four through holes 30, 31, 32 and 33, of which the through holes 32, 33 and 30 are arranged at right angles to each other with respect to the longitudinal center axis 34 of the pressure plate 6. The through hole 31 is arranged offset in the circumferential direction from the two through holes 32 and 30. The arrangement of these through holes 30 - 33 is adapted to the arrangement of the mounting screws on a vibration damper mounted on a crankshaft. This means that depending on the design of the mounting flange

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE) MN/mn ***!!*!* «**·***» "..*". September 16, 2002

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of such a vibration damper, the arrangement of the through holes 3 0 - 33 can also be chosen differently.

Each of the through holes 30-33 has a cylindrical recess 35, 36, 37 and 38, of which the two recesses 36 and 38 can be seen in the sectional view of the pressure plate 6.

On its outer surface 39 opposite these depressions 35 - 38, the pressure plate 6 has a central, circular depression 40, which in turn is provided with a central centering recess 41. This centering recess 41 serves to center a press ball 42, which is provided at the outer end of the pressure spindle 5.

Furthermore, in the present embodiment, a total of four axial pressure pins 43 are provided, the number of which corresponds in particular to the number of depressions 35 - 38 of the pressure plate. The axial pressure pins can, as shown here by way of example, be designed as a cylinder head screw, which has a corresponding cylindrical screw head 44 and a corresponding threaded shaft 45.

K283.doc

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn * &Idigr; Js. » Si &Idigr; I. "I September 16, 2002

- Page 5.5!v<sn'*is)· t · ·* &diams;»■&diams;*»·* .. .. * !

The components of the device according to the invention shown in Fig. 1 serve to remove a vibration damper 55 mounted in Fig. 2 and Fig. 3 on a crankshaft 50 of a motor vehicle engine.

Fig. 2 shows a partial front view of the vibration damper 55 together with the two clamping shells 2 and 3. It can be seen that a central mounting screw 57 is provided. As can be seen from Fig. 3, this central mounting screw is used to attach the vibration damper 55 to a crankshaft 50 of a motor vehicle engine. A toothed belt pinion 70 is provided in the axial direction behind the vibration damper 55, which is also fixedly attached to a bearing journal 52 of the crankshaft 50 via the mounting screw 57. For an additional rotationally fixed connection between the vibration damper 55 and the toothed belt pinion 70, the hexagon socket screws 56 shown in Figs. 2 and 3 are provided, which extend through the vibration damper in the area of its bearing hub 60 and are screwed into the toothed belt pinion 70.

As can be seen from Fig. 3, the vibration damper consists of a disk-shaped carrier disk 58, which in the radially inner area supports the bearing hub

Neymeyer & PARTNER GbR, Patent Attorneys 78052 ViUingen-Schwenningen (DE)

MN/mn * &iacgr; J ₉ , J ·* · i -· > September 16, 2002

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60 of the vibration damper 55. In the present embodiment, the vibration damper 55 is provided with an annular V-belt pulley 59, which has a corresponding groove profile 62 for a V-belt (not shown). This annular V-belt pulley 59 is attached to the carrier disk 58 via a circumferential rubber ring 61, which has vibration-damping properties, as is known from the prior art. As can also be seen from Fig. 3, the toothed belt pinion 70 has a central, axially projecting centering projection 71, onto which the vibration damper 55 is pressed with its bearing hub 60.

In order to pull this vibration damper 55 off this centering projection 71 without the toothed belt pinion 70 being pulled off the bearing journal 52 of the crankshaft 50, the device 1 according to the invention is provided.

To do this, first the two clamping shells 2 and 3 shown in Fig. 2 are placed on the vibration damper 55 by placing the upper clamping shell 2 in Fig. 2 in the direction of arrow 56 downwards on the vibration damper 55, while the lower clamping shell 3 in Fig. 2 is placed in the direction of arrow 66 upwards on the vibration damper 55.

K283.doc

Neymeyer & Partner GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn ***!j!I* J**J ·*'&diams;J**;**** September 16, 2002

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vibration damper 55 is attached. After the two clamping shells 2 and 3 have been attached, they are firmly connected to one another using the connecting screws 12 and 13, so that the two clamping shells 2 and 3 are firmly attached to the vibration damper 55, as can be seen in particular from Fig. 3. In the present embodiment, the two clamping shells 2 and 3 engage with their inner tooth profiles 10 and 11 in the groove profile 62 of the V-belt pulley 59. This ensures that the two clamping shells 2 and 3 are held axially in place absolutely firmly on the vibration damper 55.

Now that the two clamping shells 2 and 3 are attached to the vibration damper 55, the central assembly screw 57 and the hexagon socket screws 56 can be removed. After this assembly screw 57 and the hexagon socket screw 56 have been removed, the four axial pressure pins 43 are screwed into the now free threaded holes 72 of the toothed belt pinion 70, as can be seen in particular from Fig. 4. From Fig. 4 it can also be seen that the length of the axial pressure pins, which are designed as hexagon socket screws, for example, is designed in such a way that they extend axially beyond the

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NEYMEYER & PARTNER GbR, Patent Attorneys 78052 ViUingen-Schwenningen (DE)

MN/mn * &iacgr;&idigr;·» &iacgr;&Sgr; ! I'J** September 16, 2002

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Bearing hub 60 formed mounting flange 63 of the vibration damper 55. The pressure plate 6 is now placed onto the screw heads 44 of the axial pressure pins. Due to the recesses 35, 36, 37 and 38 provided in the pressure plate 6, a certain hold of the pressure plate 6 on the axial pressure pins 43 or their screw heads 44 is achieved. Once the pressure plate 6 has been placed on the axial pressure pins 43, the support bridge 4 is mounted on the clamping shells 2 and 3 via the mounting screws 26 shown in Fig. 1 by inserting the clamping screws 26 through the through holes 27 of the support bridge 4 and screwing them into the corresponding through threads 22, 23 of the clamping shell 2 or 25 of the clamping shell 3. This assembled state of the support bridge 4 on the clamping shells 2 and 3 is shown as an example in the sectional view of Fig. 4. Now the pressure spindle 5 is screwed into the central through-thread 2 8 of the support bridge 4 until it rests with its impact ball 42 in the centering recess 41 of the pressure plate 6.

By further screwing in the pressure spindle 5, an axial pressure is now exerted on the pressure plate 6 and via the four axial pressure pins 43 on the toothed belt pinion 70.

Neymeyer & PARTNER GbR, Patent Attorneys 78052 Villingen-Schwenningen (DE)

MN/mn ***!?!,* 3,**::**T :"*:·**! September ¹⁶ , 2002

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practiced. The support bridge 4 now moves in the axial direction of the arrow 75, so that the vibration damper 55 is pulled off the centering projection 71 of the toothed belt pinion 70 via the two clamping shells 2 and 3, which are fixedly connected to the support bridge 4.

It can be seen that due to the inventive design of the device 1, the vibration damper 55 can be safely removed in front of the centering pin 71 of the toothed belt pinion 70, since the device 1 is axially supported directly in the threaded holes 72 of the toothed belt pinion 70 via the pressure plate 6 and the axial pressure pins 43, so that the toothed belt pinion 70 remains securely on the bearing pin 52 of the crankshaft 50.

K283.doc

Claims (5)

1. Device ( 1 ) for removing a vibration damper ( 55 ) pressed onto a centering projection ( 71 ) of a toothed belt pinion ( 70 ), wherein the toothed belt pinion ( 70 ) is mounted in a rotationally fixed manner on a bearing journal ( 52 ) of a crankshaft ( 50 ) of a motor vehicle engine ( 51 ), and wherein the toothed belt pinion ( 70 ) is fastened to the bearing journal ( 52 ) by means of a central assembly screw ( 57 ), by means of which the vibration damper ( 55 ) is simultaneously held on the centering projection ( 71 ), and wherein a plurality of retaining screws ( 56 ) distributed around the circumference and screwed into the toothed belt pinion ( 70 ) are provided for the rotationally fixed connection of the vibration damper to the toothed belt pinion, and wherein the device comprises a support device ( 3 , 3 , 4 ) provided with a pressure spindle ( 5 ). ) which can be firmly mounted on the vibration damper, characterized in that a pressure plate ( 6 ) and several axial pressure pins ( 7 ) are provided for axially supporting the pressure spindle ( 5 ) on the toothed belt pinion ( 70 ), which, after removal of the mounting screws ( 56 ), can be screwed into the mounting threads ( 72 ) of the toothed belt pinion ( 70 ) and project axially outwards beyond the vibration damper ( 55 ). 2. Device ( 1 ) according to claim 1, characterized in that the support device is formed from two approximately semi-cylindrical clamping shells ( 2 , 3 ) which can be mounted on the circumference of the vibration damper ( 55 ) in a clamping or form-fitting manner, and that a support bridge ( 4 ) which connects the two clamping shells ( 2 , 3) transversely and into which the pressure spindle ( 5 ) can be screwed centrally and axially is detachably mounted on the clamping shells mounted on the vibration damper ( 55 ). 3. Device ( 1 ) according to claim 1 or 2, characterized in that the axial pressure pins ( 7 ) have screw heads ( 44 ) with which the axial pressure pins ( 7 ) are supported in axial recesses ( 35 , 36 , 37 , 38 ) of the pressure piece during the removal process. 4. Device ( 1 ) according to claim 3, characterized in that through holes ( 30 , 31 , 32 , 33 ) are provided concentrically to the depressions ( 35 , 36 , 37 , 38 ) in the pressure plate ( 6 ), through which the axial pressure pins ( 7 ) can be adjusted by means of a suitable wrench tool in order to adjust their length axially projecting beyond the vibration damper. 5. Device ( 1 ) according to one of claims 1 to 4, characterized in that the pressure plate ( 6 ) has, on its outer surface ( 39 ) axially opposite the depressions ( 35 , 36 , 37 , 38 ), a central depression ( 40 ) with a central centering trough ( 41 ) for the centered reception of a press ball ( 42 ) of the pressure spindle ( 5 ).