DE102009033180A1 - Demounting tool for demounting closure cover of crankshaft of engine, has guide element connected with handle, and pull-out rod axially movably arranged in guide element and handle, where pull-out rod exerts traction force on closure cover - Google Patents

Abstract

The tool (1) has a pull-out rod (25) for exerting traction force on a closure cover of a crankshaft. A guide element (27) axially guides the rod and has a retainer for a deformation attachment (30) at an end that is turned towards a handle (21), where the attachment deforms the cover. A traction nut (36) exerts the traction force on the deformed cover, and a clamping nut (26) limits axial displacement of the rod opposite to the guide element. The guide element is connected with the handle, and the rod is axially movably arranged in the guide element and the handle. An independent claim is also included for a method for demounting a closure cover of a crankshaft.

Description

The The invention relates to a disassembly tool for crankshaft shutter cover according to claim 1 and a method for disassembling a cup-shaped Crankshaft shutter cover according to claim 8.

Crankshafts usually have in the region of the crankshaft journal oil supply, which are supplied by drilling from the journal starting from. The lubricating oil is supplied to the shaft journal and the basic bearing through holes in the crankcase and in the upper shell of the base camp. To reduce weight and inertial forces, high-quality crankshafts receive equalization holes in the area of the shaft and crank pin. These compensation holes are included for manufacturing reasons in the lubricating oil supply of the crank pin. In operation, however, the compensation bores at their outlets must be sealed tight. This is conventionally achieved with pressed-in and rolled-in, cup-shaped sheet-metal lids. Such structures are for example from the DE 195 21 815 or the DE 100 38 612 known.

at The overhaul of the engine requires the fasteners Remove the compensation holes from the crankshaft to the Compensation holes of deposited components of the lubricating oil supply to clean. Since the closure cap often as cup-shaped, formed in an undercut rolled sheet metal lid, which exist in a certain depth in the interior of the compensation hole, is the previous disassembly of appropriate cap always associated with a machining operation. For disassembly must Drilled and ground in the area of the cover giving considerable care and a substantial amount of experience condition of the responsible mechanic. In addition exists always the probability of residues the removed closure lid, which at a later time to dysfunctions, increased wear or possible leakage of the system.

From the DE 196 36 147 C2 An arrangement of closure caps in balancing bores of a crankshaft is known, which provide a simplified assembly and disassembly. The in the DE 196 36 147 C2 However, presented closure cover represent a technically extremely complicated design, which is expensive to manufacture and handling and thus can not represent a preferred embodiment.

task The invention therefore provides a disassembly tool, with which crankshaft cap easy and without special Expertise can be removed, in particular under Avoidance of chip-producing activities such as Drilling or grinding.

According to the invention this task by a disassembly tool with components after the Claim 1 or by a disassembly method according to claim 8. Expedient developments of the dismantling tool are given in the dependent claims 2 to 7.

The cup-shaped closure cap are usually used in introduced in the crank pin compensation holes. The closure cap are in this case formed axially displaceable and are usually in the compensation holes through in an undercut engaging projections in their intended Held closed position.

The Disassembly tool according to the invention for a crankshaft shutter cover includes a handle for handling of the tool, which preferably with a designed as a striking surface reinforced end is provided, a pull-out rod for exercise a tensile force on a closure lid to be removed, a guide element for the axial guidance of the drawbar within the compensation bore, wherein the guide element facing away from the handle at its End has a receptacle for a deformation attachment, for example, as a rejuvenated ingredient which the deformation attachment can be attached can be formed can. Furthermore, the dismounting tool comprises a deformation attachment for deformation of the closure cap, a pull nut for exercise a tensile force on the deformed closure cap and a Clamping nut for limiting the axial offset of the extension rod opposite the guide element. The guide element is firmly connected to the handle, preferably screwed into this, and the pull-out rod is in the guide element and in the handle arranged axially displaceable.

The corresponding composition of the disassembly tool according to the invention causes the extension rod, which is guided axially in the guide element, is designed to be movable in the axial direction relative to the deformation attachment, so that the arranged on the, the handle remote from the end of the dismantling tool and connected to the pull-out rod nut in the cup-shaped closure lid can be introduced. Then, the deformation attachment can be moved relative to the extension rod or to the pull nut to perform a deformation of the crankshaft shutter cover, such that a the Zugmutter receiving cavity is formed.

In a development of the disassembly tool according to the invention is at the handle end of the clamping nut on the extension rod such arranged that it is formed inside the handle. The Clamping nut, whose task is the limitation of the axial offset the extension rod relative to the guide element is therefore not affected by the handling, so when pulling out the deformed cap all movable components within the balancing bore or within the handling handle of the disassembly tool present.

In a further embodiment of the invention the pull nut is at the opposite of the handle End of the guide element on the extension rod, preferably arranged outside of the deformation attachment. To this Way, a simplified introduction to a cup-shaped Closure cap reached.

The Disassembly tool according to the invention has in one expedient embodiment of the deformation attachment on a side facing away from the guide element End at least one cutting edge, preferably an asymmetric radial external cutting edge. The deformation attachment is adapted in its diameter of the compensation hole such that the cutting edge lies flush against the wall of the bore can act on the cap to between wall and To intervene closure lid and deform it. For this it is necessary that the cutting edge is asymmetric radially outboard is designed to minimize the axial compressive force on the Exercise closure cap.

In a further advantageous embodiment of Disassembly tool has the cutting edge of the deformation attachment radially inward over a curved surface course, which merges into a sliding surface, wherein the curved surface course preferably one having circular track-like shape.

about such a curved curved surface, which merges into a sliding surface, it is possible a defined deformation of the edge of the cup-shaped To perform closure cap, which in a kind of training a narrowed collar, above the pull nut results. The Sliding surface is used to guide the cap wall used to a uniform deformation to ensure.

In a further advantageous embodiment of Disassembly tool is the deformation attachment as a hollow cylinder educated. This ensures that the deformation is radially symmetrical on the entire wall of the cup-shaped closure lid acts.

In another expedient embodiment the deformation attachment as a hollow cylinder with pewter-like Cutting projections formed, wherein the cylinder jacket is interrupted between the cutting projections.

A such a batt-like formation of the cutting projections, which could also be called a deformation crown, has the advantage that not the complete wall of the cup-shaped Closure lid is deformed, but that only those ingredients subject to a deformation, which treats of the cutting projections become. This can be achieved that a lower compressive force in the longitudinal direction of the balancing bore on the tool must be exercised to the required deformation to achieve.

• 1. Einbringen einer Zugmutter an einer Auszugstange in den Innenraum des becherförmigen Verschlussdeckels durch Einführung des Demontagewerkzeugs in die Ausgleichsbohrung, wobei die Auszugstange innerhalb des Führungselements axial geführt wird, und das Führungselement mit dem daran angeordneten Deformationsaufsatz ebenfalls in die Bohrung eingeführt wird.
• 2. Deformation des Randes des becherförmigen Kurbelwellenverschlussdeckels oberhalb der Zugmutter mittels eines die Auszugstange zumindest teilweise umgebenden Deformationsaufsatzes zur Bildung eines verengten Kragens, dessen Öffnung kleiner ausgebildet ist, als der Durchmesser der eingebrachten Zugmutter. Der somit geschaffene Hohlraum nimmt die Zugmutter in sich auf.
• 3. Entfernen des nunmehr formschlüssig an der Zugmutter befestigten deformierten Kurbelwellenverschlussdeckels durch Herausziehen der Auszugstange, bzw. des gesamten Demontagewerkzeugs mit samt dem Kurbelwellenverschlussdeckel aus der Bohrung. Hierbei kann es als vorteilhaft angesehen werden, die Deformation des Kurbelwellenverschlussdeckels soweit vorzunehmen, dass der in einen Hinterstich eingreifende Vorsprung, welcher normalerweise den Deckel gegen ein Verrutschen absichert, aufgrund der Kragenbildung durch die Deformation bereits aus dem Hinterstich herausgezogen wird. Hierdurch entfällt der Sicherungsmechanismus des Verschlussdeckels und die Entfernung kann leichter vonstatten gehen.

The inventive method for disassembling a cup-shaped crankshaft shutter cover has the following method steps:

• 1. introducing a pull nut on a pull rod in the interior of the cup-shaped closure lid by inserting the removal tool in the balancing hole, wherein the pull rod is axially guided within the guide member, and the guide member is also introduced with the deformation attachment thereon in the bore.
• 2. Deformation of the edge of the cup-shaped crankshaft shutter cover above the pull nut by means of a Auszugstange at least partially surrounding deformation attachment to form a constricted collar whose opening is smaller than the diameter of the introduced tensile mother. The thus created cavity takes on the tensile nut in itself.
• 3. Remove the now form-fitting fastened to the tension nut deformed crankshaft shutter cover by pulling the pull-out rod, or the entire dismantling tool together with the crankshaft shutter cover from the hole. It may be considered advantageous to make the deformation of the crankshaft cover so far that the engaging in an undercut projection, which normally secures the lid against slipping, is already pulled out of the undercut due to the formation of the collar by the deformation. This eliminates the locking mechanism of the cap and the removal can be easier.

One Example of a disassembly tool according to the invention and a schematic representation of the invention Method is shown in the following embodiment. However, the invention is not limited to this illustrated embodiment limited. It rather encompasses all those designs, which make use of the concept essential to the invention.

It demonstrate:

1 an inventive disassembly tool inserted into a balancing bore before the deformation of the closure cap,

2 an exploded view of the disassembly tool according to the invention,

• a) becherförmigen Verschlussdeckels,
• b) Schnitts durch ein zylindrisches Deformationswerkzeug,
• c) Deformationswerkzeugs als Deformationskrone,

3 schematic representations of a

• a) cup-shaped closure lid,
• b) section through a cylindrical deformation tool,
• c) deformation tool as a deformation crown,

4 Detail / sectional view of an introduced into a bore disassembly tool before the deformation of the cap.

In detail shows 1 an inventive disassembly tool 1 , which with its front end in a compensation hole 2 a crankpin 3 was inserted, wherein in the compensation hole 2 a closure lid 4 is available.

2 shows an exploded view of the deformation tool according to the invention 1 , The deformation tool 1 consists of a handle part 21 , which at its upper end with an impact reinforcement 22 is provided. Inside the handle 21 there is a cavity 23 , which at its lower end preferably with a thread 24 can be provided. The cavity 23 houses a sleeve 23a , which preferably opposite the impact reinforcement 22 or the handle itself axially with a. Spring is loaded. Optionally, the spring-loaded sleeve pushes 23a the pull-out bar 25 towards the cap 4 , so that its end always in the lower bottom area of the cap 4 is arranged. In this cavity 23 insertable is the pull-out bar 25 formed, which at its upper end a chip nut 26 having. The pull-out bar 25 is through the guide element 27 passed through a central bore, wherein the guide element 27 at its upper end a thread 28 which is in the thread 24 which is under control 21 is provided, is screwed and although up to a stop 29 , which the screwing depth of the guide element 27 in the grip 21 limited. The guide element 27 is thus with the handle 21 firmly connected by the screw, the pull-out rod 25 passing through the guide element 27 is guided, in this and in the grip 21 is formed axially movable. The lower end of the guide element 27 has a taper for receiving a deformation attachment 30 on which is on the guide element 27 is designed plugged. Taking into account a sufficient accuracy of fit an additional attachment of the deformation attachment on the guide element is not necessary, but may optionally be provided by a thread formation or another type of attachment.

At the bottom of the deformation attachment 30 located radially outward lying the cutting edge 31 which must be formed as free of burrs as possible in order to allow a precise introduction between the wall of the bore and the wall of the closure cap. The cutting edge 31 goes on the radially inner side of the deformation attachment 30 in a guide 32 over which guides the deformed edge of the closure lid along a predetermined course.

At the bottom of the pull-out bar 25 is a thread 35 provided on which in the assembled state of the dismantling tool a pull nut 36 can be screwed on. Preferably, this mother 36 by the Federballast on the sleeve 23a pressed to the bottom side of the closure lid. Instead of the tension nut, other components which are comparable in their extent can be provided, for example tension pulleys or differently shaped radial thickenings, which are suitable for use in accordance with the invention.

3a shows a closure lid 4 the usual characteristic cup shape. The cup has a projection on its periphery 41 on, which engages in the assembled state in an undercut, which is provided in the wall of the bore, and thus secures the closure lid against slipping.

3b shows a section through a deformation attachment according to the invention 30 , which at its lower end a cutting edge 31 having. The radially outer asymmetric cutting edge is in its interior over a radius 42 in a sliding surface 43 over, so that the deformation of the edge 45 the closure lid 4 along a defined direction.

3c shows a further deformation attachment according to the invention 46 which is present as a cylindrical deformation attachment with arranged on crenellated projections cutting. Such deformation attachments can be referred to as a deformation crown, for example. The deformation crown 46 also has a cutting edge 31 , a radius 42 as well as a sliding surface 43 on. The representations of the 3a to 3c are schematic and thus not true to scale. The deformation attachments 30 respectively. 46 are always in their diameter to the diameter of the cap 4 adjusted so that the cutting edge between the wall of the hole 2 and the edge 45 the closure lid 4 can penetrate to the edge 45 to deform in the radially inward direction.

4 shows a representation in section of a demotage tool according to the invention, wherein the guide element 27 into a hole 2 was introduced in a crankshaft journal, and the deformation attachment 30 at the top 45 the closure lid 4 is applied. The cap 4 engages in an undercut 51 with a lead 41 a, and is therefore secured by this against accidental slipping out. Inside the cup-shaped closure lid is inventively arranged the tension nut 36 , which at a front end of the pull-out bar 25 is attached.

By applying pressure, for example, by a blow to the impact reinforcement 22 or by manual pressure on the handle 21 , which firmly with the guide element 27 and thus with the deformation attachment 30 connected, is the cutting edge 31 between the wall of the hole 2 and the edge 45 the closure lid 4 pushed in, causing a slipping of the edge 45 along the direction of movement 52 along the radius 42 to the sliding surface 43 he follows. By sufficient impressions of the cutting edge 31 in the area of the cap 4 can be achieved that in the backstitch 51 engaging projection 41 is moved in a radially inward direction, and thus also eliminates the securing mechanism. The edge 45 the closure lid 4 forms after deformation of a constricted collar, which receives the pull nut in a lying below the collar cavity, and pulling the pull nut 36 makes impossible without taking the cap. Here it is necessary that a sufficient deformation of the edge 45 takes place, so that the positive connection between the pull nut and cap is given. The train mother 36 can in this case in the interior of the cap 4 still have game, however, the training of the narrowed collar of the top edge 45 the closure lid 4 be sufficient to the cap 4 in this way, together with the removal tool from the hole 2 to be able to pull out.

1

Removal tool

2

compensating bore

3

crank pin

4

cap

21

handle part

22

impact reinforcement

23

cavity

23a

shell

24

thread

25

extension bar

26

locknut

27

guide element

28

thread

29

attack

30

deformation essay

31

cutting edge

32

guide

35

thread

36

tension nut

41

head Start

42

radius

43

sliding surface

45

upper edge

46

deformation crown

51

undercut

52

movement direction

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19521815 [0002]
• - DE 10038612 [0002]
• - DE 19636147 C2 [0004, 0004]

Claims (8)

Disassembly tool ( 1 ) for a crankshaft cap ( 4 ) - a handle ( 21 ) for handling the tool, preferably with a striking surface ( 22 ) reinforced end - a pull-out rod ( 25 ) for exerting a tensile force on a closure cap ( 4 ) - a guiding element ( 27 ) for the axial guidance of the pull-out rod ( 25 ), wherein the guide element ( 27 ) at its the handle ( 21 ) end facing a receptacle for a deformation attachment ( 30 ) - a deformation attachment ( 30 ) for deformation of the closure cap ( 4 ) - a tensile nut ( 36 ) for exerting a tensile force on the deformed closure cap ( 4 ) - a clamping nut ( 26 ) to limit the axial displacement of the extension rod ( 25 ) relative to the guide element ( 27 ) wherein the guide element ( 27 ) with the handle ( 21 ), and the pull-out rod ( 25 ) in the guide element ( 27 ) and under control ( 21 ) Is arranged axially displaceable. Disassembly tool according to claim 1, characterized in that the clamping nut ( 26 ) at the handle end of the extension rod ( 25 ), preferably under control ( 21 ) is arranged horizontally. Disassembly tool according to claim 1 or 2, characterized in that the tensile nut ( 36 ) on the handle ( 21 ) opposite end of the guide element ( 27 ) on the extension rod ( 25 ), preferably outside the deformation attachment ( 30 ) is arranged. Disassembly tool according to one of the preceding claims, characterized in that the deformation attachment ( 30 ) on a guide element ( 27 ) facing away from the end of at least one cutting edge ( 31 ), preferably has an asymmetrically radially outer cutting edge. Disassembly tool according to claim 4, characterized in that the cutting edge ( 31 ) of the deformation attachment radially inwardly over a curved surface course in a sliding surface ( 43 ), wherein the curved surface course preferably has a circular path-like shape, in particular with a radius ( 42 ) of about 5 mm. Disassembly tool according to one of the preceding Claims, characterized in that the deformation attachment is designed as a hollow cylinder. Disassembly tool according to one of the preceding claims, characterized in that the deformation attachment ( 46 ) is formed as a hollow cylinder with crenelated cutting projections, wherein the cylinder jacket is interrupted between the cutting projections. Method for dismantling a cup-shaped crankshaft shutter cover ( 4 ) comprising the following method steps: - introducing a tensile nut ( 36 ) on a pull-out rod ( 25 ) in the interior of the closure lid ( 4 ), - deformation of the edge ( 45 ) of the cup-shaped crankshaft shutter cover ( 4 ) above the nut ( 36 ) by means of a pull rod ( 25 ) at least partially surrounding deformation attachment ( 30 ) for forming a constricted collar whose opening is smaller than the diameter of the introduced tensile nut ( 36 ), - removal of the form fit on the tension nut ( 36 ) fixed deformed crankshaft shutter cover ( 4 ) by pulling out the pull-out rod ( 25 ) together with the crankshaft cap.