DE8710674U1 - Cable sleeve for Bowden cable - Google Patents

Description

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The invention relates to a cable sleeve for a Bowden cable according to the preamble of claim 1.

A generic cable sleeve is known, for example, from EP-A 0 127 759. In the brake cable fastening known from this publication, a cover body consisting of two or more half shells is attached to a brake shield. One half shell is welded to the brake shield, while the second half shell is detachably held to the first half shell.

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Hypobank Rosenheim (bank code 70020001) account no. 62*1O182'886"

Postal Check Office Munich (bank code Z0010080) Account No. 327284-807

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The two half shells run into two hollow cylinder halves at their end opposite the brake plate, which serve as an insertion or plug-in opening for inserting or plugging in the cable sleeve of a Bowden cable.

While in the state of the art mentioned at the beginning an intermediate sleeve is placed on the upper hollow cylinder half, into the opposite end of which a conventional cable sleeve with a projection can be inserted, in the brake cable fastening known from EP-A 0 104 092 a specially manufactured cable sleeve is used which has a tubular projection which can be placed over the two hollow cylinder halves of the cover body mentioned, and which is thus supported against the cover housing.

The brake cable fastenings known from the above-mentioned publications have proven to be very effective in practice, in particular due to the low construction costs and in particular the small axial length of the cover housing. Above all, this design of the brake cable fastening also means that a subsequent fastening of a brake cable or its replacement is possible at any time without any problems, without the safety and strength of the brake cable fastening being compromised.

However, in the known embodiments, as mentioned, specifically adapted cable sleeves are required for plugging onto the two hollow cylinder halves of the cover body or an intermediate sleeve into which a conventional cable sleeve with a front attachment can be plugged and then plugged over the hollow cylinder halves together with the intermediate sleeve.

The object of the present invention is therefore to provide |

To overcome disadvantages according to the state of the art and to further improve such a cable sleeve for a Bowden cable, in particular for an internal shoe brake, in such a way that, while avoiding expensive special adaptation, a secure anchoring of the cable sleeve on the one hand to the sheath of the Bowden cable and on the other hand | a problem-free support on a cover body is ensured with simple means.

The task is accomplished according to the invention in accordance with the

drawing part of claim 1. Advantageous embodiments of the invention are described in the

Subclaims specified. %

I f With the cable sleeve according to the invention for a Bowden cable, in particular for internal shoe brakes, the manufacturing costs can be reduced to about 1/3 of the usual manufacturing costs compared to a conventional cable sleeve. If one considers that such a cable sleeve and Bowden cables in general are mass-produced items that are produced in the millions every year, it is all the more surprising that such drastic savings and reductions in manufacturing costs are possible.

The cable sleeve according to the invention consists at least partially of a pressed or stamped part and/or at least of a cast or injection-molded part.

In a preferred embodiment of the invention

The cable sleeve is pressed from a piece of pipe and welded. |

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Between the two opposite pipe attachments, recesses are embossed from the outside, so that at this point not only the sheathing of the Bowden cable, but also a designated core of the Bowden cable rests against and is supported by the correspondingly formed passage opening, through which only the actual brake cable is guided and centered. In a preferred embodiment, these notches for tapering the passage cross-section for the brake cable can easily be designed in the manner of, for example, three or four humps, which are embossed from the outside.

In an alternative embodiment, the cable sleeve can consist of a tubular injection-molded part, for example made of aluminum or plastic, whereby one tube attachment of the cast or injection-molded part can be firmly clamped to the sheath of the Bowden cable via a stamping ring.

In a third embodiment, a turned part is used for the cable sleeve. The conventional cable sleeves known from the state of the art are made entirely from a turned part, which causes high manufacturing costs, especially for the specifically required known cable sleeve. This is because with the known cable sleeve, the pipe attachment with which the cable sleeve is attached to the hollow cylinder halves must be turned out from the inside. With the cable sleeve according to the invention, only a turned part with a short axial length is used with preferably opposite recesses made from the outside, onto which a conventional pipe attachment can be pushed in order to then press the two parts together.

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The cable sleeve component, which is made from a turned part, requires only low costs for processing.

Further advantages, details and features of the invention emerge from the exemplary embodiments shown below with reference to the drawings. In detail:

Figure 1 : a schematic longitudinal section through

form the parting plane of a cover body

the two half shells;

Figure 2 : a top view of the cable sleeve

according to Figure 1;

Figure 3 : a longitudinal section through another

Example of a cable sleeve;

Figure 4: a front view from above of the cable sleeve according to Figure 3;

Figure 5: a longitudinal sectional view through another embodiment of a cable sleeve;

Figure 6 : a cross-sectional view along the line

C-D in Figure 5.

Figure 1 shows a brake plate 1, below which a brake shoe (no longer shown) and a brake hub are located. In a known manner, the brake shoes can be pressed apart by means of an expansion lock 7.

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The expansion lock 7 has, among other things, an expansion lever 11, which engages in a lower hooking opening 13 of a towing eye 15, to which the brake cable is hooked.

The cover body consists of two half shells 17 and 19, which protrude through a through opening 23 into the brake shield 1 with their projections 21 provided at the lower end. In Figure 1, only one of the two half shells 17 and 19 is shown in dashed lines. While one half shell is welded to the brake shield 1 at its lower projection 21, for example a-'f on the underside, the other half shell is detachable and is only secured against axial displacement by projections or notches 25 which protrude into one another and are provided on an edge flange area 27 on the two half shells.

The Bowden cable 29 shown in the drawings comprises a brake cable 31 which is guided outside the cover body in a sheath 33, at the end of which a cable sleeve 35 is provided. Furthermore, it can be seen in Figure 1 that between the outer sheath 33 and the actual brake cable 31 there is a so-called core 37 which encloses the brake cable 31 and which can move and be displaced within certain limits along the cable. In Figure 1 the core 37 protrudes slightly beyond the lower end of the sheath 33.

For further information on the structure of the brake cable fastening explained above, reference is made to the disclosure content of the published European patent applications 0 184 092 and 0 127 759.

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In the brake shield fastening according to Figure 1, the two half shells forming a cover head merge into two hollow cylinder halves 39 at their end opposite the brake shield 1. The cable sleeve 35 with its one pipe extension 41 is placed onto these two hollow cylinder halves 39.

An opposite pipe extension 43 serves to accommodate the brake cable BK 29, i.e. internally to accommodate and support the casing 33 and the core 37. In the embodiment shown - as can be seen in particular from Figure 2 - four notches or depressions 47 are embossed from the outside in an intermediate section 45, which are designed in the manner of inward-pointing humps. The remaining clearance between the humps is dimensioned such that just the inner brake cable 31 can be guided through the opening thus formed, whereas the casing 33 and above all the core 37 rest against the humps on the front side without the core being able to pass through the opening thus formed. The cable sleeve 35 thus formed can then be brought into the shape shown in Figure 1 in a pressing and stamping process, whereby a uniform pipe diameter can be assumed. Since the upper pipe extension 43 is pressed to a smaller outer diameter, this results in the greater material thickness shown in Figure 1 compared to the lower pipe extension 41, which has a larger diameter.

As can also be seen from Figure 1, the lower tube extension 41 can have an axial length that corresponds to the length of the hollow cylinder halves 39, thereby providing double support on the edge flange areas 27 of the half shells.

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17 or 19 and on the upper pin edge of the hollow cylinder half 39 for the cable sleeve 35 is possible,

In the embodiment shown in Figure 3, a cast or molded part made of aluminum or plastic, for example, is used for the cable sleeve 35. A further illustration of the cover body or the other parts required for the brake cable fastening has been omitted in Figure 3, since otherwise the structure of the brake cable fastening corresponds to Figure 1.

When using a cable sleeve 35 made from a cast or injection-molded part, a metal ring 49 is placed over the upper pipe attachment 43 as a pressed or stamped part. By pressing this metal ring 49, the upper pipe attachment of the cable sleeve 35, which is made of light metal or plastic, for example, is pressed onto the sheath 33, so that the cable sleeve 35 can be easily and securely attached to the sheath 33 of the Bowden cable 29.

The intermediate section 45 is provided with an intermediate base and a hole guide, which only serves to guide the inner brake cable 31. The lower pipe extension 41 can correspond in size and dimensions to the embodiment according to Figure 1. In particular, when using a plastic part for the cable sleeve 35, it is useful to use a support ring 51, which is inserted into the pot base 53 of the lower pipe extension 51. The upper peripheral edge of the two hollow cylinder halves 39 then rests against this support ring 51, preferably made of metal.

This ensures that the upper end edges of the hollow cylinder halves 39 cannot dig into and imprint on the cable sleeve 35, which may be made of plastic, over time.

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In the embodiment shown in Figure 5, the cable sleeve 35 consists of a first rotary part 55 and a second component pressed together in the form of the pipe socket 41. The rotary part 55 has at least two opposing notches or, for example, an annular groove 57 into which the pipe socket 41 is inserted on the outer circumference. The rotary part 55 is designed in such a way that it is secured against any axial displacement after pressing. In this case, with a suitable tool, the upper pipe socket 43 can be pressed onto a Bowden cable that is initially inserted, i.e. onto the sheath 33 inserted there, and at the same time the still initially inserted loosely attached pipe attachment part 41 is pressed together with the rotary part 55. Due to the small axial length and the special design, the manufacturing costs for the rotary part 55 and thus the manufacturing costs for the cable sleeve 35 are extremely low overall. As can be seen from Figure 6, the pipe attachment part 41 is pressed into the annular groove 57 at two opposite points and ^is thus held immovably in the axial direction on the rotary part 55. The fact that the pipe attachment part 41 can be rotated about its longitudinal axis is irrelevant.

Claims (8)

Claims: 10 1. Cable sleeve for a Bowden cable, in particular for an internal shoe brake, in which a cover body, consisting of a half-shell (19) welded to the brake shield (1) and a second removable half-shell, which run into two hollow cylinder halves (39) on the side opposite the brake shield (1) and are held here to prevent them from folding out sideways, is seated at a through opening (23) in the brake shield (1), wherein the cable sleeve has two opposite pipe extensions (41, 43) forming an insertion or plug-on opening -01 H/pöbiihk Roeenhölm (BLZ 70020001) Account no. 6210182886*'" Postcheckamt München (BL2 7ÖÖ1Ö080) Account no. G27284-ÖÖ7 ¹ for attachment to the two hollow cylinder halves (39) or to form an insertion opening for the sheath (33) of the Bowden cable (29) and an intermediate section (45) which is provided with a bore merely for the passage of the brake cable (31), characterized in that the cable sleeve (35) consists at least partially of a pressed or stamped part and/or at least partially of a cast or injection-molded part. 2. Cable sleeve according to claim 1, characterized in that at least one pipe extension (43) for receiving the sheath (33) of the Bowden cable (29) is pressed to a smaller diameter and that the intermediate section (45) is also pressed and embossed with inward notches such that the inner diameter remaining in the pressed and embossed intermediate section (45) is greater than or equal to the thickness of the brake cable (31) passed through and smaller than the outer diameter of the sheath (33i) and of a possible core (37). 3. Cable sleeve according to claim 1 or 2, characterized in that the intermediate section (45) is formed by at least two notches/depressions (47) embossed opposite one another from the outside to the inside. 4. Cable sleeve according to claim 2 or 3, characterized in that several, preferably four, hump-shaped impressions (47) are introduced into the intermediate section (45) in a regular circumferential distribution. 4*· t · »I S« Hit I «44 ! ! * ■ «ill Ii i > · < till lit ·» · Ii ti Ii < 5. Cable sleeve according to claim 1, characterized in that the one-piece cable sleeve is assembled from two components, one component consisting of a rotary part (55) with a pipe extension (43) ₍ preferably for receiving the sheath (33) of the Bowden cable (29), on the outer circumference of which, preferably on its intermediate section (45), at least one recess or a step shoulder (5?j) is introduced, onto which a tubular extension piece is placed to form the other pipe extension (41). 1Ö and with a partial circumferential surface in the recess or is pressed or compressed into the step extension (57). 6. Cable sleeve according to claim 5, characterized in that the recess or the notch (57) consists of at least one annular groove or of at least two longitudinal grooves (57) preferably arranged opposite one another, into which the attached pipe extension is pressed with at least a partial circumferential surface. 7. Cable sleeve according to claim 6, characterized in that the pipe extension (41) placed on the rotating part (55) is pressed into the recess, notch or annular groove (57) adjacent to its front end, preferably on at least two partial circumferential areas of the pipe extension (41) arranged at an equal distance from one another. 8. Cable sleeve according to claim 1, characterized in that it consists of a cast or injection-molded part, preferably made of plastic or light metal, onto one of the pipe 3Q attachments (43) of which a metal ring (49) is attached, via which the pipe attachment (43) can be pressed with the sheath (33) of the Bowden cable (29). ·· · till i I I I I &igr; _> « I &igr;&igr;&igr;&igr; , &igr;&igr; -^ 9i Cable sleeve according to claim 1 or 8, characterized in that a support ring (51) is inserted into the pot bottoms (63) of the lower pipe extension (41) ^to accommodate the hollow cylinder halves (39) of the cover body, by means of which the cable sleeve (35) can be supported on the front side of the hollow cylinder halves (39). &Igr;&Ogr;* Cable sleeve according to one of claims 1 to 9, characterized in that the one pipe extension (41) can be inserted into the two hollow cylinder halves (39), and that the cable sleeve (35) can be supported on the two hollow cylinder halves (39) via an outwardly projecting flange. -04