DE20004486U1 - Device for releasing a or the like in a receiving bore of a bearing eye. tight screw - Google Patents

Description

NEYMEYER & PARTNER GbR, Patent Attorneys · ··.» >·.«·· 78052 Villingen-Schwenningen (DE)

MN/mn ^ ···* ··· *··**·** *..*%.* March 14, 2000

Applicant ref.: K

Applicant: Klann Tools Ltd., 13 Harrier Park, Didcot, Oxfordshire, 0X11 7PL, GB

Applicant No.: 8635978

Designation: Device for releasing a

Mounting hole of a bearing eye or similar fixed screw

Description

The invention relates to a device for loosening a screw that is firmly seated in a receiving bore of a bearing eye or the like, in particular a clamping or fastening screw of an axle component of a motor vehicle axle.

Motor vehicle axles are known in which essentially cylindrical pivot pins are clamped in a bearing bore of a slotted bearing eye. The pivot pin is part of a ball joint that is arranged, for example, at the outer end of a wishbone of a motor vehicle axle. The bearing eye with its bearing bore for receiving the pivot pin can be arranged, for example, at the upper end of a steering knuckle of the motor vehicle axle. In order to hold the pivot pin firmly in the bearing bore, the bearing eye has a radially extending groove in the area of the bearing bore to the bearing eye.

K243.doc

NEYMEYER & PARTNER GbR, Patent Attorneys · · ti 1 *··* * · · 78052 Villingen-Schwenningen (DE)

MN/mn ···· ··· *.·**..* *«.*'■».* 14 March 2000

Clamping slot through which two clamping flanges are formed, which are provided with a corresponding receiving hole for a clamping screw, through which the bearing bore can be clamped in conjunction with a clamping nut that can be screwed onto the clamping screw. This clamping process clamps the pivot pin firmly in the bearing bore. To further ensure that the pivot pin cannot slip out of the bearing bore even when the clamping screw is loosened but not removed, this clamping screw is arranged transversely to the bearing bore at a radial distance from the bearing bore, at which the clamping screw at least partially protrudes laterally into the bearing bore. Accordingly, the pivot pin has a circumferential receiving groove into which the clamping screw protrudes when assembled. There is therefore a positive connection between the clamping screw and the pivot pin via its circumferential receiving groove, so that the pivot pin cannot slip out of the bearing bore of the slotted bearing eye even when the clamping screw is loose.

It has been shown that with this type of joint connection, after a long period of operation, the clamping screw rusts firmly in its mounting holes and can therefore only be removed with difficulty. In some cases, it is necessary to heat the bearing eye in order to

K243.doc

NEYMEYER & PARTNER GbR, Patent Attorneys ·* I * I * *··« Il · 78052 Vilüngen-Schwenningen (DE)

MN/mn ···· ··· *·.**··* "··**·♦" March 14, 2000

The clamping screw is too hot to move in the mounting holes. However, this heating of the bearing eye severely damages the ball joints, which are provided with rubber sleeves towards the bearing eye. This in turn means that during simple repair work, in which the ball joints should not actually be replaced, these ball joints are damaged and have to be replaced, which increases the repair costs considerably. Since the clamping screw partially protrudes into the bearing holes of the pivot pins, it is absolutely necessary to completely remove the clamping screw in order to remove the pivot pins from their bearing holes.

Furthermore, motor vehicle axles are known in which shock absorbers are attached to the axle body via a bearing eye. For this purpose, the bearing eye has a mounting hole through which a fastening screw is inserted. The bearing eye of the shock absorber is held between two bearing flanges, which are also penetrated by the fastening screw. To hold the bearing eye securely between the bearing flanges, the fastening screw is provided with a retaining nut. In the case of this connection too, after a longer period of operation of the vehicle, it becomes apparent that the fastening screw in the mounting hole of the

K243.doc

NEYMEYER & PARTNER GbR, patent attorneys · * * . I I *. · &Xgr; ! MN/mn ···· ««» .· ·* »»

78052 Villingen-Schwenningen (DE) 14 March 2000

The bearing eye can rust and its removal, e.g. to change the shock absorber, is extremely difficult. The fastening screw is often so tightly seated in the mounting hole that it can no longer be loosened and pushed out using conventional means.

The invention is therefore based on the object of creating a device by means of which a clamping or fastening screw that is firmly seated in a receiving bore of a bearing eye or the like can be loosened safely in a simple manner.

The object is achieved according to the invention in that a support body is provided with a first and a second, approximately parallel, lateral support wall, with which the support body can be attached to the bearing eye in the area of the clamping or fastening screw, and in that the first support wall has a pressure device with a guide cylinder in which a pressure bolt is guided in a guide bore, which can be axially displaced in the receiving bore by a pressure nut screwed onto the guide cylinder to loosen the clamping or fastening screw.

The inventive design of the device enables extremely tight clamping or

K243.doc

NEYMEYER & Partner GbR, Patent Attorneys «* ! , II *··« Il · 78052 Vmingen-Schwenningen (DE)

MN/mn *··* ··· *..■**«** *··***.* March 14, 2000

Fastening screws can be easily and safely pressed out of the receiving bore of their bearing seat. For this purpose, the first support wall has a pressure device with a guide cylinder. A pressure bolt is guided axially displaceably in the guide cylinder. A guide bore is provided to guide the pressure bolt, which can be pushed onto the threaded section of the clamping or fastening screw that protrudes outwards from the bearing eye when the pressure bolt is retracted. To apply the necessary high pressing pressure, a pressure nut is provided, which is screwed onto an external thread of the guide cylinder that is relatively large in diameter. Due to this relatively large diameter of the threaded connection between the pressure nut and the guide cylinder, extremely large axial forces can be exerted on the pressure bolt by the pressure nut without the threaded connection being damaged. In addition, the threaded connection between the pressure nut and the guide cylinder is designed in such a way that an impact wrench can be used without damaging this threaded connection. This means that extremely tight clamping screws can be safely loosened using the pressure device according to the invention.

The design according to claim 2 enables an extremely variable use of the device according to the invention

K243.doc

NEYMEYER & PARTNER GbR, Patent Attorneys ·* * . I I *··« ? · · 780S2 ViDingen-Schwenningen (DE)

MN/mn *&idigr;·* *»· *..**i»* *·*·'*.* March 14, 2000

guaranteed. The exchangeable design of the guide cylinder means that it can be adapted to the requirements, particularly with regard to its dimensions - to the respective application. This means that several pressure devices can be provided, which can be easily exchanged for one another depending on the application. In order to ensure that the device is positioned in a defined manner on a bearing eye, the second support wall has a recess through which the clamping or fastening screw is pressed when pressed out. This recess at least partially encloses the screw head of the clamping or fastening screw at the start of the pressing-out process, whereby the support body can be precisely positioned on the bearing eye via the screw head of the clamping or fastening screw.

To further improve the guiding function of the recess in the second support wall, this is designed as a receiving bore for receiving the screw head according to claim 3. In this way, the support body is held in a precise position on the bearing eye at least at the beginning of the pressing-out process of the clamping or fastening screw. In order to ensure that the force is applied as centrally as possible when pressing out or loosening the clamping or fastening screw by the pressure device,

K243.doc

NEYMEYER & PARTNER GBR, Patent Attorneys · « . . . ·<«··* 78052 VMingen-Schwenningen (DE)

MN/mn «··» ··· '..' ⁸ p. ******** March 14, 2000

To ensure this, the receiving bore is arranged coaxially to the pressure device of the first retaining wall.

According to claim 4, the recess in the second support wall is part of a separate receiving cylinder that is interchangeably inserted, in particular screwed, into the second support wall. As a result, the device according to the invention can be used variably, since several receiving cylinders can be provided, which also have differently dimensioned receiving holes to adapt to the size of the screw head of the screw to be loosened.

For further variable use, the guide cylinder and the receiving cylinder are optionally interchangeable with each other and can be screwed into the first or second supporting wall.

According to claim 6, the guide cylinder and the receiving cylinder can each be screwed into the respective support wall to such an extent that the bearing eye is accommodated approximately between the guide cylinder and the receiving cylinder. If the bearing eye is a bearing eye, for example of a shock absorber, which is accommodated between two bearing flanges of a motor vehicle axle, the screw-in depth must be selected according to the external dimensions of the bearing flanges accommodating the bearing eye. An absolute limitation of the

K243.doc

NEYMEYER & PARTNER GbR, Patent Attorneys « I , I J *··« £ · I 78052 Villingen-Schwenningen (DE) .· . J _# ".·**; ·*·».·

MN/mn *i·* **· "·· s-«~ ".»****' March 14, 2000

However, the screw depth is not absolutely necessary, since the larger external dimensions of the two bearing flanges in the
Comparison to the intermediate bearing eye can also be taken into account by the guide cylinder
and/or the receiving cylinder is correspondingly less
be screwed into the corresponding retaining wall without
that the screw-in depth would have to be limited to this smaller dimension.

Due to the hardened design of the pressure bolt according to
Claim 7 ensures that its deformation is prevented even under extremely high pressing forces, so that the pressure bolt in
the guide bore of the guide cylinder certainly not
can jam.

According to claim 8, the pressure bolt has a pressure stamp which is inserted into a guide bore of the

guide cylinder. This guide hole is
in diameter the diameter of the clamping screw
This ensures that the clamping or
At the beginning of the pressing process, the fastening screw must be pushed out of the mounting hole of the bearing eye or the

bearing flanges protruding threaded section is completely accommodated in the guide bore. This ensures a
precise guidance and stabilization of this
Threaded section of the clamping or fastening screw

safely guaranteed, so that even with the largest

K243.doc

Neymeyer & Partner GbR, patent attorneys · MN /mn *··«»■

>« I *··· *· I 78052 VUUngen-Schwenningen (DE)

·■···***«" »·* ·-&diams;■* March 14, 2000

cannot deform due to the compressive forces of the pressure stamp and the clamping or fastening screw is safely loosened in the mounting holes of the bearing eye.

The invention is explained in more detail below with reference to the drawing. It shows:

Fig. 1 is an exploded perspective view of a printing device according to the invention;

Fig. 2 shows the printing device from Fig. 1 in assembled state;

Fig. 3 shows the pressure device from Fig. 2 together with a support body and a bearing eye of a shock absorber in perspective view.

Fig. 1 shows a pressure device 85 which can be used, for example, with the support body 1 shown in Fig. 3. This pressure device 85 is used in particular to loosen a clamping or fastening screw which is extremely firmly seated in the receiving bore of, for example, a bearing eye, as will be explained further below with reference to Fig. 3. Such a tight fit can be caused, for example, by corrosion, so that the axial pressure forces of a conventional pressure device are either not sufficient to be able to press out the fastening screw,

K243.doc

&bull;&diams;· · ·

NEYMEYER & PARTNER GBR, Patent Attorneys ** « , ) * *· . I *! * 78052 VUlingen-Schwenningen (DE)

MN/mn *'»* »·* *-.**»»* *.****«* 14 March 2000

or that these printing devices themselves may be damaged.

In order to be able to apply such high extrusion forces, the pressure device 85 according to the invention consists of a guide cylinder 8 6, the front end of which in Fig. 1 is provided with an external threaded section 87 and a cylinder section 88. In order to be able to achieve a firm hold of the guide cylinder 8 6 in one of the threaded holes 8 or 16 of lateral support walls 2 or 3 of a support body 1 (Fig. 3), the guide cylinder 8 6 is provided with a radially expanded stop collar 89, which is provided on its circumference with two wrench flats 110 and 111, via which the guide cylinder 8 6 can be screwed firmly into the threaded holes 8 or 16 using an appropriate wrench tool. At its end opposite the threaded section 87 and the cylinder section 88, the cylinder section 88 is provided with a further external thread 90, onto which a pressure nut 91 can be screwed.

For this purpose, this pressure nut 91 has an internal thread 92, the depth of which essentially corresponds to the total length of the external thread 90 or the distance between the stop collar 89 and the rear face 93 of the guide cylinder 8 6. At the inner end

K243.doc

NEYMEYER & PARTNER GbR, patent attorneys, * \. I J *··* * 1 I 78052 Villingen-Schwenningen (DE)

MN/mn **·* ··· *.&iacgr;**.«* *·»**&diams;** 14 March 2000

of the internal thread 92, the pressure nut 91 is provided with a pressing wall 94, which forms a pressing surface 95 on the inside. For rotatable actuation, the pressing wall 94 is provided on the outside with a drive hexagon 96, via which the pressure nut 91 can be driven in rotation by means of a suitable tool.

To loosen a fastening screw 63 that is stuck, for example, in a bearing eye 45 (Fig. 3), a central, offset pressure bolt 97 is provided, which has a pressure stamp 98 towards the guide cylinder 8 6, with which the pressure bolt 97 is guided axially displaceably in a guide bore 99 of the guide cylinder 8 6. The guide bore 99 has a radially expanded receiving section 100 towards the pressure nut 91, which serves to axially displaceably receive a radially expanded pressure head 101 of the pressure bolt 97, adapted to the diameter of the receiving section 100.

During operation, this pressure head 101 rests with its rear face 102 on the inner pressing surface 95 of the pressure nut 91, so that when the pressure nut 91 is screwed onto the external thread 90 of the guide cylinder 86, the pressure bolt 97 is moved axially forward in the direction of the arrow 103. The length of the pressure stamp 98 in the present embodiment essentially corresponds to the front, in the

NEYMEYER & PARTNER GbR, patent attorneys, * t . II *··* * * * 78052 Vilüngen-Schwenningen (DE)

MN/mn «··* *»· "..**&diams;,* *.***&diams;** March 14, 2000

Diameter smaller designed guide section of the guide bore 99.

Fig. 2 shows the pressure device 85 in a pre-assembled state, in which it is screwed into the threaded hole 8 of the first support wall 2 of the support body 1 (Fig. 3) with its guide cylinder 86 for use, for example. In this state, the threaded section 65 of the fastening screw 63 protruding beyond the bearing eye 45 projects into the guide hole 99 of the guide cylinder 86, as shown by way of example in Fig. 2. The pressure nut 91 is now rotated forwards in the direction of the arrow 103 until the front end face 104 of the pressure stamp 98 rests against the rear side of the threaded section 65 of the fastening screw 63. Since extremely high axial forces are also necessary to loosen an extremely tight fastening screw 63, a tool is now attached to the drive hexagon 96 of the pressure nut 91, by means of which extremely high torques can be exerted on the pressure nut 91. Such a tool is preferably a so-called impact wrench, through which these torques can be transmitted in pulses to the pressure nut 91. This impact wrench drive accordingly transmits extremely high, pulse-like axial forces from the pressure nut 91 via the pressure bolt 97 to the

NEYMEYER & PARTNER GbR, Patent Attorneys .* · . I J *··« ti t 78052 VüUngen-Schwenningen (DE) MN/mn &diams;·»* ·*· *.&diams;**.»" '&diams;*''.** March 14, 2000

free threaded section 65 of the fastening screw 63
Since the clamping screw 63 with its
Threaded section 65 is guided in the guide bore 99 with almost no play, the axial force in the

essentially without deformation of the fastening screw 63. After loosening the
Fastening screw 63 in the mounting hole of the
Bearing eye 45, the fastening screw 63 can be manually
be pushed out of the mounting hole. If

the axial forces that can be applied by hand are not sufficient to completely remove the fastening screw 63 from the bearing eye 45, the pressure device according to the invention can be replaced by a pressure device which, instead of the pressure bolt 97, has a

pressure screw, which in a corresponding
Threaded hole in another threaded cylinder
This threaded cylinder can be designed essentially the same as the
Guide cylinder 8 6 of the inventive

Pressure device 85, but instead of the

The guide bore 99 has a through-thread through which the pressure screw can be screwed to press out the fastening screw 63.

Due to the larger diameter
External thread 90 in conjunction with the internal thread 92 of the pressure nut 91 can achieve extremely high thread forces

00 O

EN 200 O

NEYMEYER & PARTNER GbR, patent attorneys ·* « , I ! *· . » Il I 78052 Villingen-Schwenningen (DE)

MN/mn ·&idigr;«* »&iacgr;· *.**%*"^# .»**»** Mar 14, 2000

In order to further ensure that no unwanted deformations of the pressure stamp 98 or the pressure head 101 occur due to the extremely high pressure load on the pressure bolt 97, the entire pressure bolt 97 is made of hardened steel or another highly resilient material.

Thus, by means of the pressure device 85 according to the invention, as described, an extremely tight fastening screw 63 can be loosened in a simple manner using, for example, an impact wrench or another tool that applies high torques, so that in the further process the fastening screw can be manually pressed out of the bearing eye 45.

As shown by way of example in Fig. 3, the pressure device 85 according to the invention can be attached to a bearing eye 45 using the support body 1. The bearing eye 45 is part of a shock absorber 25, which is only partially shown in Fig. 3. The bearing eye 45 of the shock absorber 25 is accommodated between two bearing flanges 26 and 27, which are part of a motor vehicle axle not shown in the drawing. The bearing eye 45 is attached to the bearing flanges 26 and 27 in a known manner by the

NEYMEYER & PARTNER GbR, patent attorneys » . . " I ·.» ti i 78052 Villingen-Schwenningen (DE)

MN/mn **** ·*· ******** *«»***** March 14, 2000

Fastening screw 63 is held in place. This is provided with a corresponding fastening nut on its threaded section 65, which projects backwards out of the bearing eye 45 or over the bearing flange 27 in Fig. 3. This fastening nut has already been removed from the threaded section in Fig. 3 and is therefore not shown.

In order to attach the support body 1 to the bearing eye 45 or the bearing flanges 26 and 27, the support body 1 is provided with a first and second support wall 2 and 3. These two support walls 2 and 3 each have an inward-facing, approximately U-shaped cross-sectional profile and are connected to one another via a rear wall 4, running approximately parallel to one another. This also enables precise alignment of the support body 1 on such a bearing eye 45 or on the two bearing flanges 26 and 27, since these engage around the bearing flanges 26 and 27 in a form-fitting manner when attached. For this purpose, the bearing eye 45 with the bearing flanges 26 and 27 is shown in phantom lines in Fig. 3 in this attached state.

The first support wall 2 has a threaded hole into which the guide cylinder 8 6 of the pressure device 85 is screwed after the support body 1 has been attached to the bearing eye 45. To limit the screw-in depth

NEYMEYER & PARTNER GbR, Patent Attorneys « * S ,J ' *,·&iacgr; «| S 78052 Villingen-Schwenningen (DE)

MN/mn ···# ·*» "..***#* *·***·&iacgr;* March 14, 2000

of the guide cylinder 8 6 into the threaded bore 8 of the supporting wall 2 to a defined dimension, the guide cylinder 8 6 is provided with the circumferential, radially outward-directed stop collar 89.

As can also be seen from Fig. 3, the second support wall 3 also has a threaded hole 16, which serves to replaceably accommodate a separate receiving cylinder 17. For this purpose, this receiving cylinder also has an external thread 18, with which it can be screwed into the threaded hole 16 of the second support wall 3. The screw-in depth of the receiving cylinder 17 is also limited and thus defined by an externally arranged, circumferential, radially expanded stop flange 19.

Furthermore, the receiving cylinder 17 has a central through-hole 20, which in use serves for the defined reception of the screw head 65 of the fastening screw 63. It is also provided that the central through-hole 20 is arranged directly in the second support wall 3 and receives the screw head 64 of the fastening screw 63 for the defined attachment of the support body 1 to the bearing eye 45.

However, the arrangement of the central through hole 2 0 in the separate receiving cylinder 17 has the advantage that the device according to the invention can be adapted to different

K243.doc

&Pgr;?" &Ogr;&Ggr;·:&Ggr;·: &Ggr;":!.:. L Xj", I I

* J

NEYMEYER & PARTNER GbR, patent attorneys «* J ,; ; *. · J It I 78052 VUlingen-Schwenningen (DE)

t I

MN/mn ·«·· ·>· .. .» _mt »« March 14, 2000

Fastening screws 63 with screw heads 64 of different sizes are easily adaptable. Furthermore, the threaded holes 8 and 16 are of the same size, so that the guide cylinder 8 6 of the pressure device 8 6 and the receiving cylinder 17 are interchangeable. The device according to the invention can thus be easily converted and the support body 1 can be attached to different, mirror-symmetrically constructed bearing eyes of an axle body.

Thus, the design of the pressure device according to the invention enables the fastening screw 63 in the bearing eye 45 of the shock absorber 25 to be easily loosened, since the pressure device 85 in conjunction with the support body 1 can exert extremely high compressive forces on the fastening screw 63. The guide cylinders 86 and the receiving cylinders 17 that can be screwed into the support walls 2 and 3 also enable the device according to the invention to be used in an extremely variable manner, since it can be easily adapted to fastening screws 63 of different dimensions by providing differently dimensioned and exchangeable receiving cylinders or pressure devices 85.

The use of the printing device 85 according to the invention is not limited to the merely exemplary

NEYMEYER & PARTNER GbR, Patent Attorneys , * J .J J *.·&iacgr; !« ! 78052 Villingen-Schwenningen (DE) MN/mn ·&idigr;·· *i. '.*""**" "·*""**" March 14, 2000

Bearing 45 of a shock absorber 25. The special design of the support body 1, which is matched to the bearing eye 45, is also only an example. The pressure device 85 can also be used with other holding devices which can be firmly attached to a bearing eye of a different design or in the area of the receiving holes of a clamping or fastening screw.

:
&diams;·

Claims (8)

1. Device for loosening a screw (63) firmly seated in a receiving bore of a bearing eye (45) or the like, in particular a clamping or fastening screw (63) of an axle component (45, 25, 26, 27) of a motor vehicle axle, characterized in that
that a support body (1) is provided with a first and a second, approximately parallel, lateral support wall (2, 3) with which the support body (1) can be attached to the bearing eye (45) in the region of the clamping or fastening screw (63), and
that the first support wall (2) has a pressure device (85) with a guide cylinder (99) in which a pressure bolt (97) is guided in a guide bore (99), which is axially displaceable by a pressure nut (91) screwed onto the guide cylinder (86) for loosening the clamping or fastening screw (63) in the receiving bore. 2. Device according to claim 1, characterized in that the guide cylinder (86) of the pressure device (85) forms a separate component which is replaceably screwed into the first support wall (3), and that the second support wall (3) is provided with a recess (20) through which the clamping screw (63) is pressed during pressing. 3. Device according to claim 2 or 3, characterized in that the recess (20) of the second support wall (3) for receiving the screw head (64) of the clamping or fastening screw (63) is designed as a receiving bore (20) through which the support body (1) is held in a precise position on the bearing eye (45) at least at the beginning of the pressing-out process of the clamping screw (63), and that the receiving bore (20) is arranged coaxially to the pressure device (85) of the first support wall (2). 4. Device according to claim 2, 3 or 4, characterized in that the recess (20) of the second support wall (3) is part of a separate receiving cylinder (17) which is replaceably inserted into the second support wall (3). 5. Device according to claim 4 or 5, characterized in that the guide cylinder (86) and the receiving cylinder (17) can be screwed into the first or second support wall (2 or 3) in an optional, interchangeable manner. 6. Device according to claim 6, characterized in that the guide cylinder (86) and the receiving cylinder cylinder (17) can each be screwed into the support wall (2 or 3) to such an extent that the bearing eye (45) is received approximately fittingly between the guide cylinder (86) and the receiving cylinder (17). 7. Device according to one of claims 1 to 6, characterized in that the pressure bolt (97) consists of a hardened steel. 8. Device according to claim 6 or 7, characterized in that the pressure bolt (97) has a pressure stamp (98) which is guided in the guide bore (99) of the guide cylinder (86), and that the guide bore (99) is adapted in its diameter to the diameter of the clamping screw (63), and that the clamping screw (63) is completely received in the guide bore (99) at the beginning of the pressing process with its threaded section (65) protruding from the receiving bore of the clamping flange (62).