DE102012016491A1 - Rounded wire circlip used in disassembly kit, for fastening of e.g. gear boxes of motor car, has ring bumper having annular ends whose face surfaces are tapered so that face surfaces are inclined along ring axle of torus-shaped portion - Google Patents

Abstract

The rounded wire circlip (10) comprises a ring bumper (12) that is defined by mutually spacing annular ends (13,14) to each other. The face surfaces (15,16) of the annular ends are tapered such that one of face surfaces is inclined along a ring axle (A) of a torus-shaped portion (11). The circlip main portion is made of metal selected from spring steel. Independent claims are included for the following: (1) tool for disassembling rounded wire circlip; and (2) disassembly kit comprising rounded wire circlip.

Description

The invention relates to a round wire locking ring, a tool therefor and a disassembly kit comprising the retaining ring and the tool.

Round wire locking rings, also called snap rings or circlips for short, are used for the positive, axial fixing of one or more mechanical components. Areas of use for such circlips are, in particular, gearboxes, wheels or bearings on axles, on clutches in a gearbox or other cylinders used in motor vehicles. The circlips are used within cylindrical chambers, tubes, drilled cylinders, etc. in a designated groove, or on an outside of a component, such as. As a wave, and they are suitably often made of spring steel wire with a constant cross-section, which is bent into a ring, and thus have a torus shape. They are manufactured in diameters from a few millimeters to a few meters.

In the prior art circlips are used, which have at their ends eyelets or vertically protruding hooks, so that the rings can be better disassembled. The hooks or eyes require special support rings and a location-oriented installation in the components used, including the components have more recesses or conversions to remove the retaining rings can again. Furthermore, different tools for disassembly of retaining rings are known from the prior art.

The DE 10 2005 001 386 T5 describes snap ring pliers including a handle portion and a jaw portion mounted thereon, the handle portion including a pair of handles that can be moved relative to one another. The jaw portion includes a pair of lever jaws, which extend generally parallel to each other and are mounted on the handle portion via crossed levers, so that the jaws are moved in parallel. In this case, a lever is coupled to a respective handle by means of a corresponding operating pin in order to open and close the lever jaws on the pivoting movement of the handles. The lever jaws have operating tips that engage in loops of a snap ring. With the pliers these eyelets can be pulled together or pushed apart.

From the DE 296 09 423 U1 Furthermore, a snap-ring pliers with two pliers tips is known, wherein a pliers tip is formed substantially as a cylinder body and adapted in diameter to a snap ring or circlip. The cylinder body is provided with a structured surface which has a plurality of structural protrusions and structural cuts in the form of diamond splinters in the longitudinal direction of a pliers tip.

The aforementioned pliers for disassembly of known retaining rings are complicated and therefore expensive to manufacture.

Based on this prior art, it is an object of the present invention to provide a round wire locking ring that can be easily and quickly disassembled and at the same time is inexpensive to manufacture.

This object is achieved by a round wire locking ring having the features of claim 1.

It is another object of the present invention to provide a tool train for disassembling an aforementioned round wire security ring, which is simple in construction and clever to handle.

This object is achieved by a tool for disassembling an aforementioned round wire locking ring having the features of claim 6.

Further developments of the objects are set forth in the subclaims.

The invention relates to a round wire locking ring with a continuous toroidal shape except for a ring impact, wherein the ring impact is defined by two spaced, mutually facing ring ends, each having an end face. At least one end face of the two ring ends can be chamfered, wherein this one end face or possibly both end faces is advantageously inclined to a ring axis of the torus. This is achieved according to the invention that the thus configured round wire locking ring when he sits in the groove of the object to be secured, virtually forms an "undercut" and can be used for disassembly.

A particular advantage of the locking ring according to the invention is that it is geometrically very simple, and does not require hooks, angled legs or eyelets. The production is simple and therefore particularly cost-effective.

When the ring is mounted, the end face of the at least one beveled ring end will face the body which receives the locking ring. Depending on the application, the bevelled end faces can therefore be aligned accordingly. Thus, the retaining ring can be installed in a groove in a cylinder, wherein the beveled end face or both beveled end faces facing the groove base or are, ie facing away from a center of the toroidal body away. Positioning on a shaft requires a chamfering of the at least one ring end in the opposite direction, wherein the chamfered end face (s) in turn faces the component, here a shaft surface, as such / are. In any case, a kind of undercut is created, which provides a good intervention volume for a tool.

Basically, it is sufficient that the retaining ring is bevelled only at one end, which facilitates the dismantling occurs. It is particularly preferred, however, provided that both ring ends may have beveled end faces on the ring impact, whereby two mutually facing, beveled ring ends are present. The thus configured retaining ring is easy and quick to disassemble.

Preferably, the end face of the at least one ring end is inclined at an angle in a range between 20 ° and 80 °, preferably in a range between 30 ° and 60 °, particularly preferably at about 45 ° relative to the ring axis. Dismantling is easier as a tool can intervene positively in the ring impact.

In the radial cross section, the retaining ring may be uniformly circular, oval or rectangular. Furthermore, according to the invention, the retaining ring made of metal, preferably a spring steel exist. The circlip may be made of a flat spring steel wire, although it may be made of another suitable material. For example, the snap ring may be tempered or oil bath tempered wire, hot rolled or cold drawn and tempered steel wire, or hard drawn wire. Other materials, for example, stainless steel or polymers, such as polypropylene or nylon, may also be suitable, depending on the particular application.

In a cylinder, a locking ring according to the invention will sit in the inside of the groove, wherein the locking diameter can be defined by a diameter of the cylinder. A circlip can thereby be used in simple grooves, so that no additional recesses within the cylinder are necessary for disassembly. Even for an arrangement as an outer circlip on a shaft no additional elements for positional orientation during assembly and separation for mounting are necessary. Also, no additional support rings with recesses or transverse grooves in the diameter to be secured are required for disassembly. This facilitates the production of the parts to be secured and at the same time makes them cost-effective.

For disassembly of the round wire locking ring according to the invention a tool according to the invention is further provided, which has a handle part with two handles and associated lever jaws, wherein the handles are pivotally connected to one another at a pivot point. By pressing the handles, the lever jaws are pivotable from a closed position to an open position. The at least one lever jaw can have a bevelled end face toward an end of the tool, which is inclined relative to a jaw axis that runs parallel to a tool center axis.

In this case, the beveled end face of the at least one lever jaw forms a counter bevel relative to the at least one bevelled end face of the securing ring. Furthermore, the invention provides, the end face of the at least one lever jaw facing away from the fulcrum point towards the front end bevelled form. Preferably, both lever jaws are chamfered, wherein they are arranged axially symmetrically relative to the central axis. The lever jaws thus take on the inverted form of the ring impact of the locking ring, which is to be dismantled.

Since the circlip invention requires no additional hooks or eyes, the tool provided for this purpose can be simple. The tool according to the invention is designed in the shape of pincers, but acts from the function forth as a double lever, each of the front tool jaws on the pivot point forms a lever which engages the respective associated ring end. The lever jaws have complementary inclined slopes to the obliquely running ends of the ring. This allows the ring to be easily removed from the securing position via the wedging action.

It is preferably provided that the end face of the at least one lever jaw can be inclined at an angle between 20 ° and 80 °, preferably in a range between 30 ° and 60 °, particularly preferably approximately 45 ° relative to the jaw axis of the tool. This corresponds to the chamfer of the securing ring according to the invention. The chamfers of the tool are in this case directed away from the central axis, in contrast to the chamfers of the locking ring, which may point in different directions, but the chamfers are always directed to each other. Preferably, both end faces of the lever jaws are chamfered, wherein the radially outwardly facing surfaces are arranged axisymmetric to the central axis of the tool. In order to Circlips with two bevelled faces can be disassembled quickly.

Advantageously, the front end of the lever jaws can be rounded. A bottom of the lever jaws may have a gentle rounding, so that the support of the lever jaws in the groove is gentle to components. The tool tip can be easily inserted into the annular joint of the locking ring and does not jam in the ring impact.

Further, the invention includes a disassembly kit that includes a circlip and a tool that can be engaged with the circlip. The ring ends of the locking ring have a predetermined distance from each other, so that the tool for disassembling a built-in locking ring is inserted into the ring impact. The distance relates directly to a predetermined width of juxtaposed lever jaws and the front end of the tool. It can thus be made precisely for each size of the locking ring, it being possible to provide that the ring impact has the same dimensions even with different ring sizes, to prevent changing the tool with different sized retaining rings.

According to the invention, such circlips are used, for example, as axial position locks for piston pins or as a sealing component in injection systems for internal combustion engines, in particular injectors in common rail lines. If the retaining ring lies in the receiving groove, that is to say the securing position, the bevels of the ends preferably have a groove bottom. For disassembly, the tool is inserted into the annular joint, so that the beveled ring ends are under attack. Compressing the handles has the consequence that the lever jaws are pressed apart via the pivot point and the bevelled end faces of the lever jaws are pressed against the end faces of the ring ends. This causes a slight deformation of the ring ends, so that first the ring ends and finally the entire locking ring can be pushed out of its groove. Just by the arrangement of the tapered end faces of the locking ring towards the component and the formation of an undercut into which the tool securely engages, can be disassembled with the tool particularly effective an inventive locking ring.

These and other advantages are set forth by the following description with reference to the accompanying figures. The reference to the figures in the description is to aid in the description and understanding of the subject matter. Articles or parts of objects which are substantially the same or similar may be given the same reference numerals. The figures are merely a schematic representation of an embodiment of the invention.

Showing:

1 a perspective view of a round wire locking ring according to the invention, and

2 a perspective view of a tool according to the invention.

The device according to the invention relates to a round wire locking ring or simple locking ring, for securing one or more components and their possibility of disassembly by means of a suitable tool.

In 1 is an inventive locking ring 10 represented a toroidal body 11 having a circular cross-section. The circlip 10 is not formed consistently, but has a ring impact 12 on, which is formed as a circumferential interruption, and a first ring end 13 and a second ring end 14 Are defined. The first and the second ring end 13 . 14 each have an overall flat end face 15 . 16 on. Free ends of the faces 15 . 16 are in this case arranged at a certain distance D to each other, wherein the predetermined distance D is selected in coordination with a tool to be used, with which the retaining ring 10 should be dismantled.

The faces 15 . 16 are beveled, wherein they are inclined to a ring axis A. They form with the ring axis A, which at the foremost end of the ring end 13 . 14 from a center of the cross section of the body 11 normally exits, an angle α. In the 1 an angle of 45 ° is shown; however, any angle α between 20 ° and 80 ° is possible. The faces 15 . 16 in the 1 point out of the ring plane from a center of the body 11 outward.

The locking ring according to the invention 10 is often used on the inside of a cylindrical chamber or a cylinder to serve as a securing device for another component. Likewise, the retaining ring 10 be put on a shaft as an outer snap ring. Alternatively, the faces 15 . 16 to inward pointing inclined. Fields of application for the locking ring according to the invention 10 are in particular axial position locks for piston pin or as a sealing component in injection systems for internal combustion engines, preferably injectors in common-rail lines, gearboxes, clutches in a gearbox or other cylinders used in motor vehicles.

The 2 shows a tool according to the invention 20 which resembles a pair of pliers. The tool 20 has a grip area 21 with handles 22 . 23 on which at a pivot point 24 pivotally connected to each other. The ones from the handles 22 . 23 extended thigh 25 lead into lever jaws 26 . 27 , in turn, beveled end faces 28 . 29 exhibit. A frontal end 30 is here rounded. The faces 28 . 29 are from the pivot point 24 to the front end 30 pointing towards or beveled relative to a jaw axis B at an angle β. The jaw axis B in this case runs parallel to a central axis M of the tool. The amount of the angle β corresponds to the amount of the angle α of the tapered end faces 15 . 16 of the circlip 10 wherein the inclinations of the end faces to be engaged are complementary to each other. Thus, the facing away from each other faces 28 . 29 formed axisymmetric to the central axis M.

According to the invention, the tool acts 20 as a double lever, with each jaw 26 . 27 forms a lever for itself, at the respective associated ring end 13 . 14 or their end faces 15 . 16 attacks. The lever jaws 26 . 27 point with their faces 28 . 29 a counter-slope to the chamfered ring ends 13 . 14 of the circlip 10 on. This allows the circlip 10 due to the wedge effect can be easily removed from the securing position. A user operates the handle part 21 by holding the handles 22 . 23 compresses. This will make the lever jaws 26 . 27 pivoted from a first, closed position to a second, open position.

For disassembly of a circlip 10 now becomes the tool 20 in a closed position with the front end 30 ahead in the ring kick 12 introduced so that the lever jaws 26 . 27 with their faces 28 . 29 in the ring 12 between the faces 15 . 16 the circlip 10 issue. By pressing the handles 22 . 23 become the lever jaws 26 . 27 pressed apart and the tool 20 placed in an open position, taking on the faces 15 . 16 the ring ends 13 . 14 Pressure is exercised. In the case of a security ring 10 in a groove, this causes the ring ends 13 . 14 are pushed out of the groove so that they are no longer held in the groove and due to the stresses within the locking ring 10 the entire circlip 10 is levered out of the groove.

The same applies to the disassembly of a security ring according to the invention 10 from a shaft, ie an outer mounting of the retaining ring 10 , Here are the faces 15 . 16 the ring ends 13 . 14 by applying the tool 20 levered radially outwards and the diameter of the locking ring 10 increased at short notice, after which the circlip 10 due to its elasticity almost springs out of position. The retaining rings according to the invention 10 are thus easy and fast by means of the tool 20 to release from their position.

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 102005001386 T5 [0004]
• DE 29609423 U1 [0005]

Claims (10)

Round wire locking ring with one but one ring impact ( 12 ) continuous torus form, the ring impact ( 12 ) by a spaced apart first and a second ring end ( 13 . 14 ), each having an end face ( 15 . 16 ), characterized in that at least one end face ( 15 . 16 ) of the two ring ends ( 13 . 14 ) is bevelled, wherein the at least one end face ( 15 . 16 ) is inclined to a ring axis (A) of the torus. Circlip according to claim 1, characterized in that the end face ( 15 . 16 ) of the at least one ring end ( 13 . 14 ) is facing a body which is intended, the retaining ring ( 10 ). Circlip according to claim 1 or 2, characterized in that the end face ( 15 . 16 ) of the at least one ring end ( 13 . 14 ) at an angle (α) relative to the ring axis (A) is inclined, which is in a range between 20 ° and 80 °, preferably in a range between 30 ° and 60 °, even more preferably at 45 °. Circlip according to at least one of claims 1 to 3, characterized in that both ring ends ( 13 . 14 ) at the ring impact ( 12 ) bevelled end faces ( 15 . 16 ) exhibit. Circlip according to at least one of claims 1 to 4, characterized in that the retaining ring ( 10 ) made of metal, preferably made of spring steel. Tool for disassembling a round wire locking ring ( 10 ) according to at least one of claims 1 to 5, wherein the tool ( 20 ) a handle part ( 21 ) with two handles ( 22 . 23 ) and associated lever jaws ( 26 . 27 ), wherein the handles ( 22 . 23 ) at a pivot point ( 24 ) are pivotally connected to each other and by pressing the handles ( 22 . 23 ) the lever jaws ( 26 . 27 ) are pivotable from a closed position to an open position, characterized in that at least one lever jaw ( 26 . 27 ) to a front end ( 30 ) of the tool ( 20 ) a bevelled end face ( 28 . 29 ) which is inclined relative to a jaw axis (B) which is parallel to a tool central axis (M). Tool according to claim 6, characterized in that the end face ( 28 . 29 ) the at least one lever jaw ( 26 . 27 ) at an angle (β) in a range between 20 ° and 80 °, preferably in a range between 30 ° and 60 °, most preferably at approximately 45 ° to the jaw axis (B) of the tool ( 20 ) is inclined. Tool according to claim 6 or 7, characterized in that the end face ( 28 . 29 ) the at least one lever jaw ( 26 . 27 ) from the fulcrum ( 24 ) to the front end ( 30 ) is beveled. Tool according to at least one of claims 6 to 8, characterized in that the front end ( 30 ) of the lever jaws ( 24 ) is rounded. Dismantling kit comprising a retaining ring ( 10 ) and one with the retaining ring ( 10 ) engageable tool ( 20 ), characterized in that the retaining ring ( 10 ) a retaining ring ( 10 ) according to at least one of claims 1 to 5 and the tool ( 20 ) a tool ( 20 ) according to at least one of claims 6 to 9, wherein the ring ends ( 13 . 14 ) of the retaining ring ( 10 ) have a predetermined distance (D) to each other, so that in the ring impact ( 12 ) the tool ( 20 ) for dismantling a built-in retaining ring ( 10 ) is insertable.

Images